Lower Eau Claire Lake Water Temperature
Lower Eau Claire Lake in Bayfield County, Wisconsin averages about 76°F at the surface in summer — warmest in Jul (~78°F) and coldest in May (~55°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 12 field readings (2024–2026) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lower Eau Claire Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Lower Eau Claire Lake 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 ~75°F
Summer average ~73°F
Summer average ~74°F
Summer average ~73°F
Summer average ~73°F
Summer average ~74°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Lower Eau Claire Lake?
Lower Eau Claire Lake has a typical summer surface temperature of about 76°F. It is usually warmest in July (around 78°F) and coldest in May (around 55°F). These are typical values by month from 12 EPA Water Quality Portal field readings (2024–2026), not a live reading.
When is Lower Eau Claire Lake warmest?
Surface water at Lower Eau Claire Lake is typically warmest in July, reaching about 78°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 Lower Eau Claire Lake warm enough to swim?
At its typical summer peak of about 76°F, Lower Eau Claire Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Lower Eau Claire Lake 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 — 12 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.