Round Lake Water Temperature
Round Lake in Hennepin County, Minnesota typically sits around 53°F at the surface in October — warmest in Jul (~60°F) and coldest in Jan (~39°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 (39°F) to its warmest (60°F).
Typical surface water temperature by month, from 516 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Round Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Round Lake water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
Water temperatures at nearby Minnesota lakes
Explore water temperatures
Where to stay near Round Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Round 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 Round Lake
Prices for Oct 16–18, 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 Round Lake?
Get lake water-quality updates plus the best cabin & lodging deals near Round Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Round Lake?
Round Lake typically sits around 53°F at the surface in October, from 516 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
When is Round Lake warmest?
Surface water at Round Lake is typically warmest in July, reaching about 60°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 Round Lake warm enough to swim?
At its typical summer peak of about 59°F, Round Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Round 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 — 516 readings from 1 monitoring station 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.