Lake Butte des Morts Water Temperature
Lake Butte des Morts in Winnebago County, Wisconsin averages about 75°F at the surface in summer — warmest in Jul (~76°F) and coldest in Oct (~52°F). These are typical values by 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 F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Wisconsin lakes
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Frequently asked questions
What is the water temperature of Lake Butte des Morts?
Lake Butte des Morts has a typical summer surface temperature of about 75°F. It is usually warmest in July (around 76°F) and coldest in October (around 52°F). These are typical values by month from 44 EPA Water Quality Portal field readings (2024–2026), 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.