Keller Lake Water Temperature
Keller Lake in Ramsey County, Minnesota typically sits around 69°F at the surface in September — warmest in Jul (~77°F) and coldest in Jan (~37°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 271 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Keller Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Keller Lake scored D on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Minnesota lakes
Explore water temperatures
Where to stay near Keller Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Keller 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 Keller Lake
Prices for Sep 4–6, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Keller Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Keller Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Keller Lake?
Keller Lake typically sits around 69°F at the surface in September, from 271 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
When is Keller Lake warmest?
Surface water at Keller Lake is typically warmest in July, reaching about 77°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 Keller Lake warm enough to swim?
At its typical summer peak of about 75°F, Keller Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Keller 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 — 271 readings from 3 monitoring stations between 2010 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.