Big Lasalle Lake Water Temperature
Big Lasalle Lake in Clearwater County, Minnesota typically sits around 60°F at the surface in September — warmest in Aug (~61°F) and coldest in Jun (~57°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 417 field readings (2019–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Big Lasalle Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Big Lasalle Lake scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Minnesota lakes
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Where to stay near Big Lasalle Lake
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Frequently asked questions
What is the water temperature of Big Lasalle Lake?
Big Lasalle Lake typically sits around 60°F at the surface in September, from 417 EPA Water Quality Portal field readings (2019–2025). That is a typical value for the month, not a live reading.
When is Big Lasalle Lake warmest?
Surface water at Big Lasalle Lake is typically warmest in August, reaching about 61°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 Big Lasalle Lake warm enough to swim?
At its typical summer peak of about 59°F, Big Lasalle Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Big Lasalle 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 — 417 readings from 1 monitoring station between 2019 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.