Wisconsin Lake Water Temperatures
Typical surface water temperatures for 409 Wisconsin lakes — about 69°F in September. Booth Lake runs warmest (~81°F in summer); the statewide summer average is about 74°F. Values are typical by month, not live readings.
409
Lakes with a temperature record
69°F
Typical in September
74°F
Typical summer average
81°F
Warmest: Booth Lake
Wisconsin lakes by typical summer water temperature (warmest first)
| Lake | County | Typical in September | Summer avg | Warmest | Coldest |
|---|---|---|---|---|---|
| Booth Lake | Walworth | 77°F | 81°F | 84°F (Jul) | 62°F (Oct) |
| Rock Lake | Kenosha | 73°F | 81°F | 81°F (Jul) | 69°F (May) |
| Elkhart Lake | Sheboygan | — | 81°F | 82°F (Jul) | 60°F (May) |
| Horseshoe Lake | Polk | — | 80°F | 82°F (Jul) | 40°F (Mar) |
| Crooked Lake | Waukesha | — | 80°F | 84°F (Jun) | 44°F (Mar) |
| Eagle Spring Lake | Waukesha | — | 80°F | 83°F (Jul) | 66°F (May) |
| Lake Beulah | Walworth | 72°F | 80°F | 82°F (Jun) | 58°F (May) |
| Rice Lake North | Forest | — | 80°F | 80°F (Jul) | 50°F (Apr) |
| Grass Lake | Shawano | 67°F | 80°F | 80°F (Jul) | 54°F (Apr) |
| Lake Emily | Portage | 70°F | 79°F | 80°F (Jul) | 36°F (Feb) |
| Wolf Lake | Adams | 72°F | 79°F | 82°F (Jul) | 45°F (Mar) |
| Yellowstone Lake | Lafayette | 68°F | 79°F | 79°F (Aug) | 46°F (Mar) |
| Turtle Lake | Walworth | — | 79°F | 80°F (Jun) | 46°F (Mar) |
| Fawn Lake | Adams | — | 79°F | 82°F (Jul) | 69°F (May) |
| Friess Lake | Washington | — | 79°F | 81°F (Jun) | 65°F (May) |
| Boundary Lake | Oconto | 68°F | 79°F | 82°F (Jul) | 67°F (May) |
| Long Lake | Fond du Lac | 71°F | 79°F | 79°F (Jul) | 51°F (Apr) |
| Town Corner Lake | Marinette | 72°F | 79°F | 81°F (Jul) | 67°F (May) |
| Big Bass Lake | Marathon | 70°F | 78°F | 80°F (Jun) | 56°F (Oct) |
| Lilly Lake | Kenosha | 72°F | 78°F | 80°F (Jul) | 45°F (Mar) |
| Lake Kegonsa | Dane | 72°F | 78°F | 80°F (Jul) | 62°F (May) |
| Eagle Lake | Racine | 72°F | 78°F | 81°F (Jul) | 59°F (Apr) |
| Crystal Lake | Sheboygan | 75°F | 78°F | 83°F (Jul) | 66°F (May) |
| Pretty Lake | Waukesha | 74°F | 78°F | 80°F (Jul) | 48°F (Apr) |
| Hidden Valley Lake | Lafayette | 72°F | 78°F | 80°F (Jul) | 59°F (Oct) |
| Glisezinski Lake | Portage | — | 78°F | 78°F (Jul) | 49°F (Apr) |
| Apple River Flowage Lake | Polk | 70°F | 78°F | 80°F (Jul) | 68°F (May) |
| Fish Lake | Burnett | 76°F | 78°F | 80°F (Aug) | 75°F (Jun) |
| Cruson Slough Lake | Richland | 72°F | 78°F | 83°F (Jun) | 47°F (Oct) |
| Goose Lake | Adams | — | 78°F | 79°F (Jul) | 59°F (May) |
| Ashippun Lake | Waukesha | — | 78°F | 79°F (Jun) | 47°F (Mar) |
| Ottawa Lake | Waukesha | 71°F | 78°F | 79°F (Jun) | 65°F (May) |
| Wood Lake | Burnett | — | 78°F | 81°F (Jul) | 77°F (Jun) |
| Paddock Lake | Kenosha | 74°F | 78°F | 79°F (Jul) | 70°F (Oct) |
| Hunters Lake | Waukesha | — | 78°F | 80°F (Jul) | 75°F (Aug) |
| White Ash Lake | Polk | 72°F | 78°F | 80°F (Jul) | 72°F (Sep) |
| Lower Pine Lake | Polk | 68°F | 78°F | 79°F (Jul) | 68°F (Sep) |
| Bear Paw Lake | Oconto | 71°F | 78°F | 79°F (Jul) | 67°F (Apr) |
| Oak Lake | Burnett | 72°F | 78°F | 83°F (Aug) | 55°F (Oct) |
| Little Elkhart Lake | Sheboygan | — | 78°F | 82°F (Jul) | 74°F (Aug) |
| Apple Lake | St. Croix | 65°F | 78°F | 78°F (Jul) | 65°F (Sep) |
| Lower Nemahbin Lake | Waukesha | — | 78°F | 78°F (Jun) | 54°F (Apr) |
| Silver Lake | Waupaca | 69°F | 78°F | 81°F (Jul) | 58°F (May) |
| Long Lake | Waushara | 71°F | 78°F | 80°F (Jul) | 54°F (May) |
| Taylor Lake | Waupaca | — | 78°F | 89°F (Jul) | 57°F (Apr) |
| Onland Lake | Portage | 74°F | 77°F | 79°F (Jul) | 36°F (Jan) |
| Lake Waubesa | Dane | 71°F | 77°F | 80°F (Jul) | 65°F (May) |
| Rice Lake | Dane | 75°F | 77°F | 79°F (Jul) | 67°F (Oct) |
| Pickerel Lake | Portage | 70°F | 77°F | 80°F (Jul) | 39°F (Feb) |
| Moshawquit Lake | Menominee | 71°F | 77°F | 79°F (Jul) | 62°F (Oct) |
| Pike Lake | Washington | 71°F | 77°F | 80°F (Jul) | 49°F (Apr) |
| Big Dardis Lake | Price | 71°F | 77°F | 79°F (Jul) | 63°F (May) |
| Little Cedar Lake | Washington | 68°F | 77°F | 79°F (Jul) | 44°F (Mar) |
| Red Cedar Lake | Jefferson | 69°F | 77°F | 79°F (Jul) | 69°F (Sep) |
| Moon Bay Lake | Chippewa | — | 77°F | 82°F (Jul) | 64°F (May) |
| Lac la Belle Lake | Waukesha | 72°F | 77°F | 79°F (Jul) | 65°F (May) |
| Lake Koshkonong | Jefferson | 66°F | 77°F | 82°F (Jul) | 39°F (Mar) |
| Thomas Lake | Portage | 69°F | 77°F | 80°F (Jul) | 49°F (Apr) |
| White Lake | Waupaca | 74°F | 77°F | 80°F (Jul) | 73°F (Aug) |
| Perch Lake | Oneida | — | 77°F | 79°F (Jun) | 47°F (May) |
| Lake Monona | Dane | — | 77°F | 78°F (Jul) | 76°F (Jun) |
| North White Ash Lake | Polk | 73°F | 77°F | 82°F (Jul) | 73°F (Sep) |
| Lake Five | Washington | — | 77°F | 78°F (Jul) | 69°F (May) |
| Rock Lake | Jefferson | — | 77°F | 80°F (Jul) | 40°F (Mar) |
| Paulsen Lake | Polk | 67°F | 77°F | 79°F (Jul) | 67°F (Sep) |
| Druid Lake | Washington | 71°F | 77°F | 80°F (Jul) | 68°F (May) |
| Pine Lake | Polk | 67°F | 77°F | 79°F (Jul) | 67°F (Sep) |
| Balsam Lake Little Balsam Site | Polk | 66°F | 77°F | 80°F (Jul) | 66°F (Sep) |
| Lake Ripley | Jefferson | — | 77°F | 82°F (Jul) | 45°F (Mar) |
| Thunder Lake | Oneida | — | 77°F | 81°F (Jul) | 72°F (Jun) |
| Pearl Lake | Waushara | — | 77°F | 80°F (Jul) | 62°F (May) |
| Bass Lake | Oconto | 70°F | 77°F | 82°F (Jul) | 70°F (Sep) |
| Forest Lake | Fond du Lac | — | 77°F | 79°F (Jul) | 45°F (Mar) |
| Upper Nemahbin Lake | Waukesha | — | 77°F | 79°F (Jul) | 74°F (Aug) |
| Gilkey Lake | Oconto | 69°F | 77°F | 81°F (Jul) | 69°F (Sep) |
| Lake Wingra | Dane | 71°F | 76°F | 78°F (Jul) | 51°F (Jan) |
| Jordan Lake | Adams | 72°F | 76°F | 79°F (Jul) | 41°F (Mar) |
| Lake St Croix | St. Croix | 71°F | 76°F | 78°F (Jul) | 59°F (May) |
| Tree Lake | Portage | 69°F | 76°F | 79°F (Jul) | 34°F (Feb) |
| Legend Lake | Menominee | 72°F | 76°F | 79°F (Jul) | 39°F (Feb) |
| Sandhill Lake | Ozaukee | 68°F | 76°F | 80°F (Jul) | 55°F (Oct) |
| Sunset Lake | Portage | 72°F | 76°F | 77°F (Jul) | 53°F (Apr) |
| Cedar Lake | Manitowoc | — | 76°F | 80°F (Jul) | 56°F (Apr) |
| Clam Lake | Burnett | 67°F | 76°F | 81°F (Jul) | 50°F (Oct) |
| Crystal Lake | Marquette | 71°F | 76°F | 78°F (Jul) | 61°F (May) |
| Wolf Lake | Portage | 70°F | 76°F | 80°F (Jul) | 38°F (Feb) |
| Bass Lake | St. Croix | 70°F | 76°F | 79°F (Jul) | 70°F (Sep) |
| Horseshoe Lake | Washburn | 71°F | 76°F | 78°F (Jul) | 65°F (May) |
| Two Island Lake | Chippewa | 70°F | 76°F | 79°F (Jul) | 51°F (Apr) |
| Sissabagama Lake | Sawyer | — | 76°F | 80°F (Jul) | 74°F (Jun) |
| White Mound Lake | Sauk | 72°F | 76°F | 81°F (Jul) | 72°F (Sep) |
| Fox Lake | Dodge | 69°F | 76°F | 79°F (Jul) | 44°F (Mar) |
| Mcginnis Lake | Adams | — | 76°F | 78°F (Jun) | 53°F (Apr) |
| Marl Lake | Waushara | 71°F | 76°F | 80°F (Jul) | 59°F (Oct) |
| St. Johns Lake | Forest | 71°F | 76°F | 78°F (Jul) | 41°F (Mar) |
| Helen Lake | Iowa | 69°F | 76°F | 78°F (Jun) | 52°F (Oct) |
| Pleasant Lake | Walworth | — | 76°F | 81°F (Jul) | 70°F (Jun) |
| Lake Sherwood | Adams | — | 76°F | 78°F (Jul) | 52°F (Apr) |
| Mason Lake | Adams | — | 76°F | 79°F (Jul) | 69°F (May) |
| Lake Placid | Sawyer | 71°F | 76°F | 78°F (Jun) | 44°F (Mar) |
| Horsehead Lake | Oneida | — | 76°F | 81°F (Jul) | 56°F (May) |
| Loveless Lake | Polk | 74°F | 76°F | 81°F (Jul) | 64°F (May) |
| Viola Lake | Burnett | 73°F | 76°F | 79°F (Jul) | 51°F (Apr) |
| Lake Pesobic | Lincoln | — | 76°F | 78°F (Jul) | 60°F (Apr) |
| Moccasin Lake | Vilas | 66°F | 76°F | 76°F (Aug) | 59°F (Oct) |
| De Neveu Lake | Fond du Lac | 70°F | 76°F | 78°F (Jul) | 63°F (May) |
| Ludden Lake | Iowa | 77°F | 76°F | 77°F (Jun) | 42°F (Mar) |
| Avoca Lake | Iowa | 67°F | 76°F | 77°F (Aug) | 52°F (Oct) |
| Pike Lake | Marathon | 64°F | 76°F | 78°F (Jul) | 51°F (Apr) |
| Pewaukee Lake | Waukesha | 74°F | 76°F | 76°F (Aug) | 40°F (Nov) |
| Lower Eau Claire Lake | Bayfield | — | 76°F | 78°F (Jul) | 55°F (May) |
| White Lake | Marquette | — | 76°F | 80°F (Jul) | 43°F (Mar) |
| Auburn Lake | Fond du Lac | 70°F | 76°F | 80°F (Jul) | 53°F (Apr) |
| South Twin Lake | Washburn | — | 76°F | 79°F (Jul) | 73°F (Aug) |
| Rooney Lake | Burnett | — | 76°F | 78°F (Jul) | 73°F (Aug) |
| Bakkens Pond | Sauk | 67°F | 76°F | 80°F (Jun) | 51°F (Oct) |
| Loon Lake | Burnett | 75°F | 76°F | 81°F (Jul) | 73°F (Jun) |
| Camelot Lake | Adams | — | 76°F | 80°F (Jul) | 71°F (May) |
| Lake Emily | Dodge | — | 76°F | 78°F (Jul) | 72°F (Aug) |
| North Spirit Lake | Price | — | 76°F | 76°F (Jun) | 62°F (May) |
| Fowler Lake | Waukesha | — | 76°F | 80°F (Jul) | 71°F (Jun) |
| Lily Lake | Brown | — | 76°F | 79°F (Jul) | 52°F (Apr) |
| Moose Lake | Sawyer | 69°F | 76°F | 77°F (Jul) | 69°F (Sep) |
| Spirit Lake | Taylor | — | 76°F | 76°F (Jun) | 62°F (May) |
| Big Twin Lake | Langlade | — | 76°F | 78°F (Jul) | 74°F (Aug) |
| Richter Lake | Taylor | 73°F | 76°F | 77°F (Jul) | 38°F (Apr) |
| Middle Mckenzie Lake | Burnett | 73°F | 76°F | 80°F (Aug) | 53°F (May) |
| Cochran Lake | Price | 69°F | 75°F | 78°F (Jul) | 52°F (Apr) |
| Deer Lake | Burnett | 70°F | 75°F | 77°F (Jul) | 50°F (Apr) |
| Culvert on Lake Helen | Portage | 69°F | 75°F | 79°F (Jul) | 57°F (Apr) |
| Smith Lake | Washington | 73°F | 75°F | 76°F (Jul) | 58°F (Oct) |
| Bass Lake | Barron | 70°F | 75°F | 78°F (Jul) | 53°F (Apr) |
| Oneida Lake | Outagamie | 70°F | 75°F | 77°F (Jul) | 55°F (Apr) |
| La Motte Lake | Menominee | 72°F | 75°F | 78°F (Jul) | 40°F (Feb) |
| Lake Winneconne | Winnebago | 72°F | 75°F | 77°F (Jul) | 52°F (Oct) |
| Lake Poygan | Winnebago | 71°F | 75°F | 76°F (Jul) | 52°F (Oct) |
| Shawano Lake | Shawano | 70°F | 75°F | 77°F (Jul) | 56°F (Apr) |
| Tainter Lake | Dunn | 65°F | 75°F | 77°F (Jul) | 65°F (Sep) |
| Lake Butte des Morts | Winnebago | 72°F | 75°F | 76°F (Jul) | 52°F (Oct) |
| Deep Lake | Washburn | 69°F | 75°F | 77°F (Jul) | 45°F (Nov) |
| Long Lake | Polk | 72°F | 75°F | 78°F (Jul) | 65°F (May) |
| Clearwater Lake | Oneida | 72°F | 75°F | 78°F (Jul) | 60°F (May) |
| Long Lake | Sauk | 66°F | 75°F | 79°F (Jun) | 50°F (Oct) |
| Shay Lake | Oconto | 72°F | 75°F | 77°F (Jul) | 64°F (Oct) |
| Rice Lake | Vilas | — | 75°F | 77°F (Jun) | 55°F (Apr) |
| Cedar Lake | Polk | 73°F | 75°F | 77°F (Jul) | 63°F (Oct) |
| White Clay Lake | Shawano | 72°F | 75°F | 76°F (Jul) | 52°F (Apr) |
| Rock River Lake | Rock | — | 75°F | 77°F (Jul) | 66°F (May) |
| Bear Trap Lake | Polk | 70°F | 75°F | 78°F (Jul) | 70°F (Sep) |
| Big Trade Lake | Burnett | 71°F | 75°F | 78°F (Jul) | 64°F (May) |
| Upper Turtle Lake | Barron | 69°F | 75°F | 79°F (Jul) | 50°F (Apr) |
| Round Lake | Burnett | 69°F | 75°F | 78°F (Jul) | 38°F (Mar) |
| Lower Nashotah Lake | Waukesha | 70°F | 75°F | 77°F (Jul) | 63°F (May) |
| Clear Lake | Sawyer | 71°F | 75°F | 80°F (Jul) | 64°F (May) |
| Lake Desair | Barron | — | 75°F | 77°F (Jul) | 41°F (Mar) |
| Sunset Lake | Vilas | — | 75°F | 79°F (Jul) | 45°F (Apr) |
| Rice Lake | Grant | 64°F | 75°F | 77°F (Jun) | 53°F (Oct) |
| Minerva Lake | Burnett | 66°F | 75°F | 78°F (Jul) | 66°F (May) |
| Tichigan Lake | Racine | — | 75°F | 78°F (Jul) | 64°F (May) |
| Tenmile Lake | Barron | 73°F | 75°F | 80°F (Jul) | 71°F (Jun) |
| Grindle Lake | Oconto | 72°F | 75°F | 79°F (Jul) | 64°F (May) |
| East Alaska Lake | Kewaunee | 70°F | 75°F | 81°F (Jul) | 42°F (Mar) |
| Lake Montanis | Barron | — | 75°F | 76°F (Jun) | 74°F (Aug) |
| Falk Lake | Burnett | 72°F | 75°F | 77°F (Aug) | 69°F (Oct) |
| Spirit River Flowage Lake | Lincoln | — | 75°F | 82°F (Jul) | 63°F (May) |
| Middle Eau Claire Lake | Bayfield | — | 75°F | 78°F (Jul) | 73°F (Jun) |
| Silver Lake | Barron | — | 75°F | 77°F (Jul) | 60°F (May) |
| Long Trade Lake | Polk | 70°F | 75°F | 79°F (Jul) | 70°F (Sep) |
| Imogene Lake | Vilas | — | 75°F | 77°F (Jun) | 74°F (Jul) |
| Pleasant Lake | Waushara | — | 75°F | 76°F (Aug) | 61°F (May) |
| George Lake | Oneida | — | 75°F | 77°F (Jul) | 52°F (May) |
| Matthews Lake | Washburn | — | 75°F | 78°F (Jul) | 45°F (Apr) |
| Dunn Lake | Vilas | — | 75°F | 80°F (Jul) | 72°F (Aug) |
| Jessie Lake | Langlade | — | 75°F | 79°F (Jul) | 53°F (Apr) |
| Bass Lake | Lincoln | — | 75°F | 77°F (Jul) | 46°F (Apr) |
| Lake of the Pines | Sawyer | — | 75°F | 78°F (Jul) | 72°F (Jun) |
| Reservoir Pond | Oconto | — | 75°F | 76°F (Jul) | 48°F (Nov) |
| Ranch Lake | Oconto | — | 75°F | 78°F (Jul) | 59°F (May) |
| School Section Lake | Waupaca | 68°F | 75°F | 76°F (Jul) | 56°F (May) |
| Bear Lake | Oneida | 69°F | 75°F | 76°F (Jul) | 69°F (Sep) |
| Crystal Lake | Langlade | — | 75°F | 78°F (Jul) | 51°F (May) |
| Otter Lake | Waupaca | — | 75°F | 89°F (Jul) | 48°F (Apr) |
| Horn Lake | Oconto | — | 75°F | 75°F (Jun) | 48°F (Nov) |
| Sapokesick Lake | Menominee | 74°F | 74°F | 77°F (Jul) | 38°F (Feb) |
| Big Round Lake | Polk | 68°F | 74°F | 78°F (Jul) | 50°F (Apr) |
| Big Doctor Lake | Burnett | 62°F | 74°F | 78°F (Jul) | 40°F (Mar) |
| Gaslyn Lake | Burnett | 68°F | 74°F | 77°F (Jul) | 50°F (Oct) |
| Altoona Lake | Eau Claire | 69°F | 74°F | 77°F (Jul) | 42°F (Mar) |
| Breakfast Lake | Bayfield | 68°F | 74°F | 76°F (Aug) | 58°F (Apr) |
| Baker Lake | Vilas | 66°F | 74°F | 79°F (Jul) | 35°F (Jan) |
| Prairie Lake | Barron | 69°F | 74°F | 78°F (Jul) | 69°F (Jun) |
| Bear Lake | Barron | 72°F | 74°F | 78°F (Jul) | 35°F (Feb) |
| Reisner Lake | Florence | 74°F | 74°F | 80°F (Jul) | 56°F (Oct) |
| Lake Esadore | Taylor | 70°F | 74°F | 79°F (Jul) | 35°F (Feb) |
| Lake Lime | Portage | 69°F | 74°F | 79°F (Jul) | 36°F (Feb) |
| Bear Lake | Portage | — | 74°F | 79°F (Jul) | 38°F (Feb) |
| Lake Mallalieu | St. Croix | 67°F | 74°F | 77°F (Jul) | 48°F (Mar) |
| High Lake | Vilas | 69°F | 74°F | 76°F (Jul) | 55°F (May) |
| Wapogasset Lake | Polk | 69°F | 74°F | 78°F (Jul) | 69°F (Sep) |
| Little Long Lake | Forest | 73°F | 74°F | 76°F (Jul) | 63°F (May) |
| Random Lake | Sheboygan | 68°F | 74°F | 76°F (Jul) | 40°F (Feb) |
| Windfall Lake | Forest | — | 74°F | 79°F (Jul) | 62°F (May) |
| Staples Lake | Barron | 70°F | 74°F | 76°F (Jul) | 50°F (Apr) |
| Lower Vermillion Lake | Barron | 68°F | 74°F | 77°F (Jul) | 62°F (May) |
| Archibald Lake | Oconto | 68°F | 74°F | 77°F (Jul) | 65°F (May) |
| Lake Nebagamon | Douglas | 70°F | 74°F | 78°F (Jul) | 63°F (Oct) |
| Bear Lake | Forest | — | 74°F | 79°F (Jul) | 48°F (Apr) |
| Amacoy Lake | Rusk | 67°F | 74°F | 76°F (Jul) | 66°F (May) |
| Lake Delton | Sauk | 70°F | 74°F | 76°F (Jul) | 63°F (Oct) |
| Rolling Stone Lake | Langlade | 63°F | 74°F | 75°F (Jul) | 46°F (Apr) |
| Lower Mckenzie Lake | Washburn | — | 74°F | 79°F (Jul) | 68°F (May) |
| Ellwood Lake | Florence | — | 74°F | 76°F (Jul) | 72°F (Jun) |
| Person Lake | Douglas | 65°F | 74°F | 76°F (Jul) | 65°F (Sep) |
| Sand Lake | Burnett | — | 74°F | 76°F (Jul) | 62°F (May) |
| Kekegama Lake | Washburn | 63°F | 74°F | 75°F (Jul) | 34°F (Feb) |
| Cranberry Lake | Burnett | 65°F | 74°F | 79°F (Jul) | 65°F (Sep) |
| Sea Lion Lake | Florence | 65°F | 74°F | 75°F (Jul) | 59°F (May) |
| Gunlock Lake | Vilas | — | 74°F | 75°F (Jul) | 50°F (Apr) |
| Crane Lake | Forest | — | 74°F | 80°F (Jul) | 48°F (Apr) |
| Pine Lake | Iron | — | 74°F | 76°F (Jul) | 51°F (Apr) |
| Arrowhead Lake | Adams | — | 74°F | 78°F (Jul) | 55°F (Apr) |
| Grand Portage Lake | Iron | 73°F | 74°F | 76°F (Jul) | 49°F (Apr) |
| Granite Lake at | Barron | 70°F | 74°F | 78°F (Jul) | 60°F (May) |
| Nepco Lake | Wood | 69°F | 74°F | 78°F (Jul) | 69°F (Sep) |
| Rice Lake | Barron | 69°F | 74°F | 79°F (Jul) | 69°F (Sep) |
| Berry Lake | Oconto | — | 74°F | 77°F (Jul) | 69°F (Jun) |
| Beaver Lake | Vilas | — | 74°F | 79°F (Jul) | 56°F (May) |
| Johnson Lake | Burnett | — | 74°F | 77°F (Jul) | 65°F (May) |
| Unnamed Lake | Iron | 70°F | 74°F | 77°F (Jun) | 61°F (May) |
| Lost Land Lake | Sawyer | 65°F | 74°F | 77°F (Aug) | 54°F (Apr) |
| Lower Turtle Lake | Barron | 72°F | 74°F | 75°F (Jul) | 57°F (May) |
| Spider Lake | Vilas | 70°F | 74°F | 77°F (Jul) | 47°F (Apr) |
| Bean Lake | Washburn | — | 74°F | 78°F (Jul) | 69°F (Jun) |
| Diamond Lake | Bayfield | 66°F | 74°F | 76°F (Jul) | 66°F (Sep) |
| Mckenzie Lake | Polk | 62°F | 74°F | 76°F (Jul) | 62°F (Sep) |
| Balsam Lake | Washburn | — | 74°F | 76°F (Jul) | 58°F (May) |
| Anderson Lake | Oconto | 73°F | 74°F | 77°F (Jul) | 64°F (May) |
| Lulu Lake | Shawano | — | 74°F | 77°F (Jul) | 71°F (Aug) |
| Schnur Lake | Price | — | 74°F | 81°F (Jul) | 61°F (May) |
| Moon Lake | Vilas | — | 74°F | 78°F (Jul) | 69°F (Aug) |
| Alma Lake | Vilas | — | 74°F | 78°F (Jul) | 70°F (Aug) |
| Eagle Lake | Vilas | — | 74°F | 75°F (Aug) | 60°F (May) |
| Petenwell Flowage Lake | Juneau | — | 74°F | 79°F (Jul) | 68°F (Apr) |
| Spring Lake | Manitowoc | — | 74°F | 76°F (Jul) | 72°F (Aug) |
| Tug Lake | Lincoln | 69°F | 73°F | 76°F (Jul) | 44°F (Apr) |
| Skice Lake | Menominee | 72°F | 73°F | 76°F (Jul) | 40°F (Feb) |
| Towanda Lake | Vilas | 67°F | 73°F | 75°F (Jul) | 50°F (Apr) |
| Great Bass Lake | Oneida | 68°F | 73°F | 76°F (Jul) | 55°F (Oct) |
| Tahkodah Lake | Bayfield | 69°F | 73°F | 75°F (Jul) | 53°F (May) |
| Quarry Lake | Brown | 68°F | 73°F | 76°F (Jul) | 55°F (Apr) |
| Chute Pond at | Oconto | — | 73°F | 80°F (Jul) | 64°F (May) |
| Minong Flowage Lake | Washburn | 67°F | 73°F | 76°F (Jul) | 61°F (Oct) |
| Collins Lake | Portage | 67°F | 73°F | 78°F (Jul) | 35°F (Feb) |
| Bearskin Lake | Oneida | 69°F | 73°F | 75°F (Jul) | 49°F (Apr) |
| Pelican Lake | Oneida | 66°F | 73°F | 75°F (Jul) | 46°F (Apr) |
| Mole Lake | Forest | 72°F | 73°F | 74°F (Aug) | 40°F (Nov) |
| Tiger Cat Flowage Lake | Sawyer | 71°F | 73°F | 76°F (Aug) | 60°F (May) |
| Lower Kaubashine Lake | Oneida | — | 73°F | 74°F (Jul) | 72°F (Jun) |
| Middle Kimball Lake | Washburn | 68°F | 73°F | 75°F (Jul) | 58°F (May) |
| Sand Lake | Iron | 68°F | 73°F | 75°F (Jul) | 61°F (May) |
| Butternut Lake | Price | — | 73°F | 75°F (Jul) | 68°F (Jun) |
| Fisher Lake | Iron | 67°F | 73°F | 74°F (Aug) | 67°F (Sep) |
| Long Lake | Waupaca | — | 73°F | 75°F (Jul) | 58°F (May) |
| Mud Lake | Jefferson | — | 73°F | 73°F (Jun) | 43°F (Mar) |
| Smoke Lake | Oconto | — | 73°F | 76°F (Jul) | 38°F (Jan) |
| Upper Eau Claire Lake | Bayfield | 68°F | 73°F | 78°F (Jul) | 58°F (May) |
| Echo Lake | Iron | — | 73°F | 75°F (Jul) | 60°F (May) |
| Charnley Lake | Iron | 63°F | 73°F | 75°F (Jul) | 63°F (May) |
| Pigeon Lake | Waupaca | 65°F | 73°F | 74°F (Jul) | 57°F (Apr) |
| Poskin Lake | Barron | 71°F | 73°F | 77°F (Jul) | 69°F (Jun) |
| Tom Doyle Lake | Oneida | 69°F | 73°F | 76°F (Jul) | 69°F (Sep) |
| Mud Lake | Barron | 67°F | 73°F | 76°F (Jul) | 58°F (Oct) |
| Keyes Lake | Florence | — | 73°F | 75°F (Jul) | 44°F (Apr) |
| Lost Lake | Florence | — | 73°F | 75°F (Jul) | 46°F (Apr) |
| Sand Lake | Sawyer | — | 73°F | 76°F (Jul) | 59°F (May) |
| Lac Sault Dore Lake | Price | — | 73°F | 75°F (Jun) | 64°F (May) |
| Hatch Lake | Waupaca | — | 73°F | 77°F (Jul) | 47°F (Apr) |
| Mann Lake | Vilas | — | 73°F | 76°F (Jul) | 46°F (Apr) |
| Lake Wilipyro | Bayfield | — | 73°F | 75°F (Jul) | 56°F (May) |
| Blue Lake | Oneida | — | 73°F | 74°F (Jul) | 47°F (Apr) |
| Connors Lake | Sawyer | 66°F | 73°F | 76°F (Aug) | 60°F (May) |
| Wilson Lake | Iron | — | 73°F | 74°F (Jun) | 49°F (Apr) |
| Whitefish Lake | Sawyer | — | 73°F | 76°F (Jul) | 70°F (Jun) |
| Butternut Lake | Barron | — | 73°F | 76°F (Jul) | 35°F (Feb) |
| Finger Lake | Vilas | — | 73°F | 75°F (Jul) | 72°F (Jun) |
| Mccullough Lake | Vilas | — | 73°F | 77°F (Jul) | 71°F (Aug) |
| Morton Lake | Vilas | — | 73°F | 77°F (Jul) | 70°F (Aug) |
| Cranberry Lake | Oneida | — | 73°F | 77°F (Jul) | 45°F (Apr) |
| Long Lake | Bayfield | — | 73°F | 74°F (Jul) | 66°F (May) |
| Butternut Lake | Forest | — | 73°F | 77°F (Jul) | 68°F (Jun) |
| Clark Lake | Door | — | 73°F | 77°F (Jul) | 64°F (Jun) |
| Machickanee Flowage Lake | Oconto | — | 73°F | 74°F (Jun) | 65°F (May) |
| Spider Lake | Iron | — | 73°F | 76°F (Jul) | 48°F (May) |
| Mcdonald Lake | Vilas | — | 73°F | 76°F (Aug) | 70°F (Jun) |
| Armour Lake | Vilas | — | 73°F | 79°F (Jul) | 53°F (Oct) |
| Kelly Lake | Oconto | — | 73°F | 77°F (Jul) | 68°F (May) |
| Found Lake | Vilas | — | 73°F | 76°F (Jul) | 49°F (Apr) |
| Mildred Lake | Oneida | — | 73°F | 75°F (Jul) | 71°F (Aug) |
| Washburn Lake | Oneida | — | 73°F | 75°F (Jul) | 50°F (Apr) |
| Samoset Lake | Bayfield | — | 73°F | 75°F (Jul) | 55°F (May) |
| Hancock Lake | Oneida | — | 73°F | 75°F (Jul) | 67°F (May) |
| Hasbrook Lake | Oneida | 70°F | 73°F | 78°F (Jul) | 70°F (Aug) |
| Horsehead Lake | Vilas | — | 73°F | 75°F (Jul) | 47°F (Apr) |
| Honey Lake | Walworth | 67°F | 72°F | 74°F (Jul) | 43°F (Mar) |
| Franklin Lake | Oneida | 67°F | 72°F | 74°F (Jul) | 46°F (Apr) |
| Moen Lake | Oneida | 65°F | 72°F | 75°F (Jul) | 60°F (May) |
| Stella Lake | Vilas | 68°F | 72°F | 74°F (Jul) | 49°F (Apr) |
| Fountain Lake | Portage | — | 72°F | 75°F (Jul) | 47°F (Apr) |
| Little Tamarack Flowage Lake | Vilas | 62°F | 72°F | 76°F (Jul) | 48°F (Apr) |
| Lake Menomin | Dunn | — | 72°F | 72°F (Jun) | 44°F (Mar) |
| Lake of the Falls | Iron | 67°F | 72°F | 74°F (Jul) | 55°F (Oct) |
| Carlin Lake | Vilas | 69°F | 72°F | 75°F (Jul) | 47°F (Apr) |
| Shepard Lake | Oneida | 69°F | 72°F | 76°F (Jul) | 62°F (May) |
| Lily Lake | Forest | 66°F | 72°F | 75°F (Jul) | 61°F (May) |
| Arbutus Lake | Forest | 68°F | 72°F | 74°F (Jul) | 51°F (Apr) |
| Oxbow Lake | Vilas | — | 72°F | 73°F (Jul) | 62°F (May) |
| Lee Lake | Oneida | — | 72°F | 76°F (Jul) | 70°F (Jun) |
| Patten Lake | Florence | 65°F | 72°F | 75°F (Jul) | 45°F (Apr) |
| Deer Lake | Lincoln | — | 72°F | 75°F (Jul) | 59°F (May) |
| Bass Lake | Vilas | — | 72°F | 74°F (Jul) | 47°F (Apr) |
| Mid Lake | Oneida | — | 72°F | 75°F (Jul) | 70°F (Jun) |
| Lac Courte Oreilles Lake | Sawyer | 70°F | 72°F | 73°F (Aug) | 70°F (Sep) |
| Birch Island Lake | Burnett | — | 72°F | 81°F (Jul) | 59°F (Aug) |
| Rosalind Lake | Vilas | — | 72°F | 78°F (Jul) | 48°F (Apr) |
| Gull Lake | Burnett | 64°F | 72°F | 74°F (Jun) | 62°F (Oct) |
| Little Pickerel Lake | Oconto | — | 72°F | 72°F (Jun) | 36°F (Jan) |
| Shishebogama Lake | Oneida | — | 72°F | 74°F (Jul) | 48°F (Apr) |
| Minocqua Lake | Oneida | 63°F | 72°F | 72°F (Jul) | 42°F (Apr) |
| Whitefish Lake | Douglas | — | 72°F | 75°F (Jul) | 70°F (Jun) |
| Wilson Flowage Lake | Price | — | 72°F | 72°F (Jul) | 64°F (May) |
| Mead Lake Nb Test Site | Clark | 61°F | 72°F | 76°F (Jul) | 61°F (Sep) |
| Lake Metonga | Forest | — | 72°F | 74°F (Jul) | 43°F (Apr) |
| Lone Stone Lake | Oneida | — | 72°F | 75°F (Jul) | 45°F (Apr) |
| Loon Lake | Shawano | — | 72°F | 74°F (Jun) | 61°F (May) |
| Half Moon Lake | Polk | — | 72°F | 77°F (Jul) | 67°F (Jun) |
| Ballard Lake | Vilas | — | 72°F | 75°F (Jul) | 47°F (Apr) |
| St. Louis Bay Lake | Douglas | — | 72°F | 79°F (Jul) | 64°F (May) |
| Upper Estuary Lake | Douglas | — | 72°F | 77°F (Jul) | 63°F (May) |
| Lake Alice | Lincoln | 67°F | 72°F | 73°F (Jul) | 52°F (May) |
| Squash Lake | Oneida | — | 72°F | 75°F (Jul) | 46°F (Apr) |
| Plummer Lake | Vilas | — | 72°F | 75°F (Jul) | 70°F (Aug) |
| Black Oak Lake | Vilas | — | 72°F | 75°F (Jul) | 69°F (Jun) |
| Lost Lake | Vilas | 69°F | 71°F | 73°F (Jul) | 48°F (Apr) |
| Pioneer Lake | Vilas | 67°F | 71°F | 74°F (Jul) | 58°F (May) |
| Bishop Lake | Forest | 66°F | 71°F | 72°F (Jul) | 44°F (Apr) |
| Big Portage Lake | Vilas | 66°F | 71°F | 74°F (Jul) | 61°F (May) |
| Maiden Lake | Oconto | — | 71°F | 75°F (Jul) | 33°F (Feb) |
| Kentuck Lake | Vilas | 66°F | 71°F | 75°F (Jul) | 44°F (Apr) |
| Papoose Lake | Vilas | 66°F | 71°F | 73°F (Jul) | 56°F (May) |
| Two Sisters Lake | Oneida | — | 71°F | 74°F (Jul) | 53°F (May) |
| Little Portage Lake | Vilas | 65°F | 71°F | 74°F (Jul) | 58°F (May) |
| Watersmeet Lake | Vilas | — | 71°F | 74°F (Jul) | 45°F (May) |
| Whitefish Lake | Oneida | 68°F | 71°F | 76°F (Jul) | 50°F (Nov) |
| Muskellunge Lake | Vilas | — | 71°F | 75°F (Jul) | 58°F (Oct) |
| Plum Lake | Vilas | — | 71°F | 75°F (Jul) | 67°F (Jun) |
| Big Arbor Vitae Lake | Vilas | 70°F | 71°F | 74°F (Jul) | 60°F (May) |
| Franklin Lake | Forest | — | 71°F | 74°F (Jul) | 55°F (May) |
| Mineral Lake | Ashland | 64°F | 71°F | 71°F (Aug) | 45°F (Apr) |
| Anderson Lake | Vilas | — | 71°F | 74°F (Jul) | 55°F (May) |
| Solberg Lake | Price | — | 71°F | 75°F (Jul) | 50°F (Apr) |
| Fourmile Lake | Oneida | — | 71°F | 73°F (Aug) | 69°F (Jun) |
| Flannery Lake | Oneida | 65°F | 71°F | 75°F (Aug) | 65°F (Sep) |
| Sugar Camp Lake | Oneida | — | 71°F | 74°F (Aug) | 58°F (Oct) |
| Irving Lake | Vilas | — | 71°F | 73°F (Jul) | 51°F (Apr) |
| Elsie Lake | Vilas | — | 71°F | 71°F (Aug) | 57°F (Oct) |
| Bealeau Lake | Shawano | 69°F | 70°F | 76°F (Aug) | 55°F (May) |
| Osnuhsa Lake | Brown | 67°F | 70°F | 72°F (Jul) | 60°F (May) |
| First Black Lake | Iron | 65°F | 70°F | 72°F (Jul) | 60°F (May) |
| Long Lake | Florence | 71°F | 70°F | 73°F (Jul) | 41°F (Feb) |
| Anvil Lake | Vilas | — | 70°F | 72°F (Jul) | 68°F (Jun) |
| Meta Lake | Vilas | 68°F | 70°F | 71°F (Aug) | 61°F (May) |
| Musser Lake | Price | 66°F | 70°F | 70°F (Jul) | 49°F (Apr) |
| Perch Lake | Langlade | 66°F | 70°F | 70°F (Jun) | 58°F (May) |
| St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake | Douglas | — | 70°F | 77°F (Jul) | 58°F (May) |
| Big Sand Lake | Burnett | 66°F | 69°F | 72°F (Jul) | 50°F (Oct) |
| Friendship Lake | Adams | — | 69°F | 74°F (Aug) | 64°F (Jun) |
| Gust Lake | Oneida | 63°F | 69°F | 73°F (Jul) | 63°F (Sep) |
| Rainbow Lake | Vilas | — | 69°F | 72°F (Jul) | 47°F (Apr) |
| Arkdale Lake | Adams | — | 69°F | 74°F (Jul) | 65°F (Aug) |
| Mission Lake | Shawano | 69°F | 68°F | 77°F (Aug) | 50°F (May) |
| Spring Lake | Portage | 61°F | 68°F | 72°F (Jun) | 42°F (Apr) |
| Pope Lake | Waupaca | 61°F | 68°F | 69°F (Aug) | 56°F (May) |
| Mcdill Pond | Portage | — | 68°F | 72°F (Jul) | 51°F (Apr) |
| Round Lake | Oneida | — | 68°F | 68°F (Jun) | 37°F (Feb) |
| Easton Lake | Adams | — | 68°F | 69°F (Jun) | 58°F (Apr) |
| Hill Slough Lake | Sauk | 58°F | 67°F | 77°F (Jun) | 49°F (Oct) |
| Boot Lake | Oconto | — | 67°F | 71°F (Aug) | 61°F (Jun) |
| Milwaukee River Lake | Milwaukee | 72°F | 66°F | 72°F (Sep) | 43°F (Mar) |
| Koonz Lake | Shawano | 69°F | 66°F | 75°F (Aug) | 49°F (May) |
| Mosslake_deep | Vilas | 65°F | 66°F | 71°F (Jul) | 61°F (Jun) |
| Townline Lake | Oneida | — | 66°F | 67°F (Jun) | 38°F (Feb) |
| Bullhead Lake | Manitowoc | 61°F | 65°F | 69°F (Jun) | 39°F (Feb) |
| Duluth Lake | Douglas | 58°F | 65°F | 70°F (Jul) | 56°F (May) |
| Springville Pond | Portage | — | 65°F | 67°F (Jul) | 64°F (Jun) |
| Little Fork Lake | Oneida | — | 65°F | 65°F (Jul) | 38°F (Mar) |
| Spur Lake | Oneida | 62°F | 64°F | 66°F (Jul) | 62°F (Aug) |
| Milwaukee Harbor Lake | Milwaukee | 70°F | 63°F | 70°F (Sep) | 41°F (Mar) |
| Island Lake | Oneida | — | 63°F | 63°F (Jul) | 37°F (Feb) |
| Laurel Lake | Oneida | — | 63°F | 63°F (Jul) | 37°F (Mar) |
| Cloud Lake | Forest | 64°F | 62°F | 64°F (Jul) | 40°F (Nov) |
| Sand Lake | Barron | 59°F | 62°F | 63°F (Jul) | 47°F (Apr) |
| Sams Lake | Shawano | 63°F | 61°F | 63°F (Aug) | 52°F (May) |
| Malone Lake | Shawano | 66°F | 59°F | 66°F (Sep) | 46°F (May) |
| Big Lake | Shawano | 66°F | 59°F | 66°F (Sep) | 49°F (May) |
| Flambeau Lake Deep | Vilas | 57°F | 58°F | 58°F (Jun) | 57°F (Sep) |
| Devil'S Lake | Forest | 52°F | 53°F | 55°F (Jul) | 46°F (Apr) |
| Bug Lake | Forest | 54°F | 52°F | 54°F (Aug) | 41°F (Nov) |
| King Lake | Marinette | 55°F | 51°F | 55°F (Sep) | 42°F (Apr) |
| Little Pike Lake | Iron | — | — | 41°F (Mar) | 37°F (Jan) |
More Wisconsin lake data
Frequently asked questions
Which Wisconsin lake has the warmest water?
Of the 409 Wisconsin lakes with a temperature record, Booth Lake in Walworth County runs warmest, averaging about 81°F at the surface in summer. Colder lakes like Little Pike Lake sit closer to 41°F.
What is a typical September water temperature in Wisconsin?
Across the Wisconsin lakes we track, typical September surface temperature averages about 69°F. That is a climatological value from EPA field readings, not the temperature right now. Summer averages about 74°F.
Where does this Wisconsin water temperature data come from?
Each temperature is a typical (climatological) value computed from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal. They describe what is typical for each month, not the temperature right now.
About this data
Water temperatures are a climatology — the typical value for each month, averaged from real surface-water field readings published through the EPA Water Quality Portal. They tell you what to expect, not the temperature right now.