Long Lost Lake Water Temperature
Long Lost Lake in Clearwater County, Minnesota averages about 69°F at the surface in summer — warmest in Aug (~75°F) and coldest in Jun (~59°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 84 field readings (2011–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Long Lost Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Long Lost 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 Long Lost Lake?
Long Lost Lake has a typical summer surface temperature of about 69°F. It is usually warmest in August (around 75°F) and coldest in June (around 59°F). These are typical values by month from 84 EPA Water Quality Portal field readings (2011–2025), not a live reading.
When is Long Lost Lake warmest?
Surface water at Long Lost Lake is typically warmest in August, 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 Long Lost Lake warm enough to swim?
At its typical summer peak of about 69°F, Long Lost Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Long Lost 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 — 84 readings from 5 monitoring stations between 2011 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.