Lake Beulah Water Temperature
Lake Beulah in Walworth County, Wisconsin typically sits around 72°F at the surface in September — warmest in Jun (~82°F) and coldest in May (~58°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Column height runs from this lake’s coldest month (58°F) to its warmest (82°F).
Typical surface water temperature by month, from 14 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 water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
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
Explore water temperatures
Where to stay near Lake Beulah
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Lake Beulah — 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 Beulah
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Frequently asked questions
What is the water temperature of Lake Beulah?
Lake Beulah typically sits around 72°F at the surface in September, from 14 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
When is Lake Beulah warmest?
Surface water at Lake Beulah is typically warmest in June, reaching about 82°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 — 14 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.