Larson Lake Water Temperature
Larson Lake in Itasca County, Minnesota averages about 48°F at the surface in summer — warmest in Jul (~48°F) and coldest in May (~44°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 159 field readings (2021–2021) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Larson Lake warm enough to swim?
Cold-water shock is a real risk below 50°F — unprotected swimming is unsafe and even strong swimmers can lose muscle control within minutes.
Want more than temperature? Larson 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 ~62°F
Summer average ~62°F
Summer average ~71°F
Summer average ~70°F
Summer average ~73°F
Summer average ~74°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Larson Lake?
Larson Lake has a typical summer surface temperature of about 48°F. It is usually warmest in July (around 48°F) and coldest in May (around 44°F). These are typical values by month from 159 EPA Water Quality Portal field readings (2021–2021), not a live reading.
When is Larson Lake warmest?
Surface water at Larson Lake is typically warmest in July, reaching about 48°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 Larson Lake warm enough to swim?
At its typical summer peak of about 48°F, Larson Lake rates as "very cold" for swimming. Cold-water shock is a real risk below 50°F — unprotected swimming is unsafe and even strong swimmers can lose muscle control within minutes.
Where does this Larson 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 — 159 readings from 1 monitoring station between 2021 and 2021. 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.