Sweeney Lake Water Temperature
Sweeney Lake in Hennepin County, Minnesota typically sits around 58°F at the surface in October — warmest in Aug (~71°F) and coldest in Jan (~36°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 (36°F) to its warmest (71°F).
Typical surface water temperature by month, from 196 field readings (2011–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Sweeney Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Sweeney 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 Sweeney Lake
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Frequently asked questions
What is the water temperature of Sweeney Lake?
Sweeney Lake typically sits around 58°F at the surface in October, from 196 EPA Water Quality Portal field readings (2011–2024). That is a typical value for the month, not a live reading.
When is Sweeney Lake warmest?
Surface water at Sweeney Lake is typically warmest in August, reaching about 71°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 Sweeney Lake warm enough to swim?
At its typical summer peak of about 68°F, Sweeney Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Sweeney 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 — 196 readings from 3 monitoring stations between 2011 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.