Brown Lake Water Temperature
Brown Lake in St. Louis County, Minnesota averages about 62°F at the surface in summer — warmest in Aug (~64°F) and coldest in Jun (~60°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 331 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Brown Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Brown Lake scored B 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 Brown Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Brown Lake — live availability and prices.
Top-rated places to stay near Brown Lake
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 Brown Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Brown Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Brown Lake?
Brown Lake has a typical summer surface temperature of about 62°F. It is usually warmest in August (around 64°F) and coldest in June (around 60°F). These are typical values by month from 331 EPA Water Quality Portal field readings (2010–2024), not a live reading.
When is Brown Lake warmest?
Surface water at Brown Lake is typically warmest in August, reaching about 64°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 Brown Lake warm enough to swim?
At its typical summer peak of about 62°F, Brown Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Brown 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 — 331 readings from 1 monitoring station between 2010 and 2024. 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.