Town Line Lake Water Temperature
Town Line Lake in Cass County, Minnesota typically sits around 66°F at the surface in September — warmest in Jun (~73°F) and coldest in Oct (~53°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 52 field readings (2023–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Town Line Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Town Line Lake scored C 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 ~62°F
Summer average ~65°F
Summer average ~66°F
Summer average ~73°F
Summer average ~69°F
Summer average ~68°F
Explore water temperatures
Where to stay near Town Line Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Town Line 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 Town Line 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 Town Line Lake?
Town Line Lake typically sits around 66°F at the surface in September, from 52 EPA Water Quality Portal field readings (2023–2024). That is a typical value for the month, not a live reading.
When is Town Line Lake warmest?
Surface water at Town Line Lake is typically warmest in June, reaching about 73°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 Town Line Lake warm enough to swim?
At its typical summer peak of about 71°F, Town Line Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Town Line 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 — 52 readings from 2 monitoring stations between 2023 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.