Indiana Lake Water Temperatures
Typical surface water temperatures for 7 Indiana lakes — about 73°F in September. Lake George runs warmest (~81°F in summer); the statewide summer average is about 78°F. Values are typical by month, not live readings.
Indiana lakes by typical summer water temperature (warmest first)
| Lake | County | Typical in September | Summer avg | Warmest | Coldest |
|---|---|---|---|---|---|
| Lake George | Steuben | — | 81°F | 85°F (Jul) | 76°F (Jun) |
| Pike Lake | Kosciusko | 78°F | 79°F | 81°F (Jul) | 52°F (Apr) |
| Middle Lagoon Lake | Lake | 71°F | 78°F | 79°F (Jul) | 61°F (May) |
| Big Chapman Lake | Kosciusko | — | 78°F | 82°F (Jul) | 73°F (Jun) |
| Grand Calumet Lagoon Lake | Lake | 68°F | 78°F | 80°F (Aug) | 68°F (Sep) |
| Big Barbee Lake | Kosciusko | — | 76°F | 81°F (Jul) | 72°F (Jun) |
| Syracuse Lake | Kosciusko | 74°F | 75°F | 78°F (Jul) | 72°F (Jun) |
More Indiana lake data
Frequently asked questions
Which Indiana lake has the warmest water?
Of the 7 Indiana lakes with a temperature record, Lake George in Steuben County runs warmest, averaging about 81°F at the surface in summer. Colder lakes like Syracuse Lake sit closer to 75°F.
What is a typical September water temperature in Indiana?
Across the Indiana lakes we track, typical September surface temperature averages about 73°F. That is a climatological value from EPA field readings, not the temperature right now. Summer averages about 78°F.
Where does this Indiana 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.