Beltrami Lake Water Temperature
Beltrami Lake in Beltrami County, Minnesota typically sits around 66°F at the surface in September — warmest in Jul (~74°F) and coldest in May (~55°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 97 field readings (2018–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Beltrami Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Beltrami 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
Summer average ~68°F
Summer average ~71°F
Summer average ~71°F
Summer average ~75°F
Summer average ~64°F
Summer average ~74°F
Explore water temperatures
Where to stay near Beltrami Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Beltrami Lake — 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 Beltrami Lake
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Frequently asked questions
What is the water temperature of Beltrami Lake?
Beltrami Lake typically sits around 66°F at the surface in September, from 97 EPA Water Quality Portal field readings (2018–2025). That is a typical value for the month, not a live reading.
When is Beltrami Lake warmest?
Surface water at Beltrami Lake is typically warmest in July, reaching about 74°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 Beltrami Lake warm enough to swim?
At its typical summer peak of about 70°F, Beltrami Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Beltrami 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 — 97 readings from 2 monitoring stations between 2018 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.