Little St Germain Lake Water Temperature
Little St Germain Lake in Vilas County, Wisconsin averages about 70°F at the surface in summer — warmest in Jul (~75°F) and coldest in May (~59°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 14 field readings (2025–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Little St Germain Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Little St Germain Lake scored C on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
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Frequently asked questions
What is the water temperature of Little St Germain Lake?
Little St Germain Lake has a typical summer surface temperature of about 70°F. It is usually warmest in July (around 75°F) and coldest in May (around 59°F). These are typical values by month from 14 EPA Water Quality Portal field readings (2025–2025), not a live reading.
When is Little St Germain Lake warmest?
Surface water at Little St Germain Lake is typically warmest in July, reaching about 75°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 Little St Germain Lake warm enough to swim?
At its typical summer peak of about 70°F, Little St Germain Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Little St Germain 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 — 14 readings from 2 monitoring stations between 2025 and 2025. 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.