Sweeney-Twin Lake Water Temperature
Sweeney-Twin Lake in Hennepin County, Minnesota averages about 61°F at the surface in summer — warmest in Aug (~64°F) and coldest in Apr (~43°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 392 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Sweeney-Twin Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Sweeney-Twin Lake scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
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Frequently asked questions
What is the water temperature of Sweeney-Twin Lake?
Sweeney-Twin Lake has a typical summer surface temperature of about 61°F. It is usually warmest in August (around 64°F) and coldest in April (around 43°F). These are typical values by month from 392 EPA Water Quality Portal field readings (2010–2024), not a live reading.
When is Sweeney-Twin Lake warmest?
Surface water at Sweeney-Twin Lake is typically warmest in August, reaching about 64°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-Twin Lake warm enough to swim?
At its typical summer peak of about 61°F, Sweeney-Twin Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Sweeney-Twin 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 — 392 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.