Hen Lake Water Temperature
Hen Lake in Crow Wing County, Minnesota averages about 59°F at the surface in summer — warmest in Sep (~67°F) and coldest in Oct (~49°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 184 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Hen Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Hen 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 ~63°F
Summer average ~65°F
Summer average ~75°F
Summer average ~73°F
Summer average ~63°F
Summer average ~74°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Hen Lake?
Hen Lake has a typical summer surface temperature of about 59°F. It is usually warmest in September (around 67°F) and coldest in October (around 49°F). These are typical values by month from 184 EPA Water Quality Portal field readings (2010–2025), not a live reading.
When is Hen Lake warmest?
Surface water at Hen Lake is typically warmest in September, reaching about 67°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 Hen Lake warm enough to swim?
At its typical summer peak of about 59°F, Hen Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Hen 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 — 184 readings from 2 monitoring stations 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.