Helen Lake Water Temperature
Helen Lake in Itasca County, Minnesota averages about 63°F at the surface in summer — warmest in Jul (~64°F) and coldest in May (~52°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 35 field readings (2019–2019) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Helen Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Helen Lake scored B 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 ~55°F
Summer average ~72°F
Summer average ~68°F
Summer average ~65°F
Summer average ~63°F
Summer average ~69°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Helen Lake?
Helen Lake has a typical summer surface temperature of about 63°F. It is usually warmest in July (around 64°F) and coldest in May (around 52°F). These are typical values by month from 35 EPA Water Quality Portal field readings (2019–2019), not a live reading.
When is Helen Lake warmest?
Surface water at Helen Lake is typically warmest in July, 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 Helen Lake warm enough to swim?
At its typical summer peak of about 63°F, Helen Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Helen 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 — 35 readings from 1 monitoring station between 2019 and 2019. 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.