Gervais Lake Water Temperature
Gervais Lake in Ramsey County, Minnesota typically sits around 50°F at the surface in October — warmest in Aug (~61°F) and coldest in Jan (~37°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Column height runs from this lake’s coldest month (37°F) to its warmest (61°F).
Typical surface water temperature by month, from 1,332 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Gervais Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Gervais Lake water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
Water temperatures at nearby Minnesota lakes
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Where to stay near Gervais Lake
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Frequently asked questions
What is the water temperature of Gervais Lake?
Gervais Lake typically sits around 50°F at the surface in October, from 1,332 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
When is Gervais Lake warmest?
Surface water at Gervais Lake is typically warmest in August, reaching about 61°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 Gervais Lake warm enough to swim?
At its typical summer peak of about 59°F, Gervais Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Gervais 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 — 1,332 readings from 1 monitoring station 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.