Lake Beulah Water Temperature
Lake Beulah in Walworth County, Wisconsin averages about 80°F at the surface in summer — warmest in Jun (~81°F) and coldest in May (~58°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 28 field readings (2024–2026) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Beulah warm enough to swim?
Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Want more than temperature? Lake Beulah scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Wisconsin lakes
Summer average ~81°F
Summer average ~80°F
Summer average ~72°F
Summer average ~78°F
Summer average ~76°F
Summer average ~78°F
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Frequently asked questions
What is the water temperature of Lake Beulah?
Lake Beulah has a typical summer surface temperature of about 80°F. It is usually warmest in June (around 81°F) and coldest in May (around 58°F). These are typical values by month from 28 EPA Water Quality Portal field readings (2024–2026), not a live reading.
When is Lake Beulah warmest?
Surface water at Lake Beulah is typically warmest in June, reaching about 81°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 Beulah warm enough to swim?
At its typical summer peak of about 80°F, Lake Beulah rates as "warm" for swimming. Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Where does this Lake Beulah 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 — 28 readings from 2 monitoring stations 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.