Lake Butte des Morts Water Temperature
Lake Butte des Morts in Winnebago County, Wisconsin typically sits around 72°F at the surface in September — warmest in Jul (~76°F) and coldest in Oct (~52°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 44 field readings (2024–2026) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Butte des Morts warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Lake Butte des Morts scored NR on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Wisconsin lakes
Explore water temperatures
Where to stay near Lake Butte des Morts
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Lake Butte des Morts — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lake Butte des Morts
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Frequently asked questions
What is the water temperature of Lake Butte des Morts?
Lake Butte des Morts typically sits around 72°F at the surface in September, from 44 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
When is Lake Butte des Morts warmest?
Surface water at Lake Butte des Morts is typically warmest in July, reaching about 76°F. Lake surface temperature lags air temperature by several weeks, so the warmest water usually arrives in mid-to-late summer even though the hottest air can come earlier.
Is Lake Butte des Morts warm enough to swim?
At its typical summer peak of about 75°F, Lake Butte des Morts rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Lake Butte des Morts water temperature data come from?
Every temperature on this page 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 — 44 readings from 1 monitoring station between 2024 and 2026. 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 collected by state and federal agencies and published through the EPA Water Quality Portal. They tell you what to expect, not the temperature at this moment. Actual conditions vary with recent weather, depth, and time of day.