Courthouse Lake Water Temperature
Courthouse Lake in Carver County, Minnesota averages about 56°F at the surface in summer — warmest in Sep (~63°F) and coldest in Jan (~38°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 1,699 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Courthouse Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Courthouse 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 ~59°F
Summer average ~71°F
Summer average ~73°F
Summer average ~74°F
Summer average ~69°F
Summer average ~57°F
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Frequently asked questions
What is the water temperature of Courthouse Lake?
Courthouse Lake has a typical summer surface temperature of about 56°F. It is usually warmest in September (around 63°F) and coldest in January (around 38°F). These are typical values by month from 1,699 EPA Water Quality Portal field readings (2010–2025), not a live reading.
When is Courthouse Lake warmest?
Surface water at Courthouse Lake is typically warmest in September, reaching about 63°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 Courthouse Lake warm enough to swim?
At its typical summer peak of about 56°F, Courthouse Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Courthouse 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 — 1,699 readings from 3 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.