Ossawinnamakee Lake Water Temperature
Ossawinnamakee Lake in Crow Wing County, Minnesota averages about 62°F at the surface in summer — warmest in Jun (~70°F) and coldest in Aug (~57°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 92 field readings (2017–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Ossawinnamakee Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Ossawinnamakee Lake scored A 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 Ossawinnamakee Lake?
Ossawinnamakee Lake has a typical summer surface temperature of about 62°F. It is usually warmest in June (around 70°F) and coldest in August (around 57°F). These are typical values by month from 92 EPA Water Quality Portal field readings (2017–2025), not a live reading.
When is Ossawinnamakee Lake warmest?
Surface water at Ossawinnamakee Lake is typically warmest in June, reaching about 70°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 Ossawinnamakee Lake warm enough to swim?
At its typical summer peak of about 62°F, Ossawinnamakee Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Ossawinnamakee 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 — 92 readings from 1 monitoring station between 2017 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.