Jellums Lake Water Temperature
Jellums Lake in Washington County, Minnesota typically sits around 52°F at the surface in October — warmest in Jul (~72°F) and coldest in Apr (~47°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 (47°F) to its warmest (72°F).
Typical surface water temperature by month, from 195 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Jellums Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Jellums 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 Jellums Lake
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Frequently asked questions
What is the water temperature of Jellums Lake?
Jellums Lake typically sits around 52°F at the surface in October, from 195 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
When is Jellums Lake warmest?
Surface water at Jellums Lake is typically warmest in July, reaching about 72°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 Jellums Lake warm enough to swim?
At its typical summer peak of about 70°F, Jellums Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Jellums 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 — 195 readings from 2 monitoring stations between 2010 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.