Twin Lake Water Temperature
Twin Lake in Washington County, Minnesota typically sits around 61°F at the surface in September — warmest in Aug (~65°F) and coldest in Apr (~44°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 264 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Twin Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Twin 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 ~73°F
Summer average ~55°F
Summer average ~58°F
Summer average ~73°F
Summer average ~60°F
Summer average ~72°F
Explore water temperatures
Where to stay near Twin Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Twin 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 Twin Lake
Prices for Sep 4–6, 4 adults. Change dates on the map below.
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Frequently asked questions
What is the water temperature of Twin Lake?
Twin Lake typically sits around 61°F at the surface in September, from 264 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
When is Twin Lake warmest?
Surface water at Twin Lake is typically warmest in August, reaching about 65°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 Twin Lake warm enough to swim?
At its typical summer peak of about 62°F, Twin Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Twin 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 — 264 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.