Millstone Lake Water Temperature
Millstone Lake in Wright County, Minnesota typically sits around 62°F at the surface in September — warmest in Jun (~75°F) and coldest in Sep (~62°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 62 field readings (2022–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Millstone Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Millstone Lake scored F 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 Millstone Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Millstone 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 Millstone Lake
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Frequently asked questions
What is the water temperature of Millstone Lake?
Millstone Lake typically sits around 62°F at the surface in September, from 62 EPA Water Quality Portal field readings (2022–2022). That is a typical value for the month, not a live reading.
When is Millstone Lake warmest?
Surface water at Millstone Lake is typically warmest in June, reaching about 75°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 Millstone Lake warm enough to swim?
At its typical summer peak of about 72°F, Millstone Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Millstone 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 — 62 readings from 1 monitoring station between 2022 and 2022. 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.