Loon Lake Deep Water Temperature
Loon Lake Deep in Cook County, Minnesota typically sits around 53°F at the surface in October — warmest in Jun (~75°F) and coldest in Oct (~53°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Column height runs from this lake’s coldest month (53°F) to its warmest (75°F).
Typical surface water temperature by month, from 58 field readings (2010–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Loon Lake Deep warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Loon Lake Deep water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
Water temperatures at nearby Minnesota lakes
Summer average ~70°F
Summer average ~72°F
Summer average ~67°F
Summer average ~73°F
Summer average ~72°F
Summer average ~73°F
Explore water temperatures
Where to stay near Loon Lake Deep
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Loon Lake Deep — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Loon Lake Deep
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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Frequently asked questions
What is the water temperature of Loon Lake Deep?
Loon Lake Deep typically sits around 53°F at the surface in October, from 58 EPA Water Quality Portal field readings (2010–2022). That is a typical value for the month, not a live reading.
When is Loon Lake Deep warmest?
Surface water at Loon Lake Deep is typically warmest in June, 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 Loon Lake Deep warm enough to swim?
At its typical summer peak of about 72°F, Loon Lake Deep rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Loon Lake Deep 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 — 58 readings from 4 monitoring stations between 2010 and 2022. 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.