Hattie Lake Water Temperature
Hattie Lake in Hubbard County, Minnesota typically sits around 67°F at the surface in September — warmest in Jul (~71°F) and coldest in May (~59°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 92 field readings (2024–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Hattie Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Hattie 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
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Where to stay near Hattie Lake
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Frequently asked questions
What is the water temperature of Hattie Lake?
Hattie Lake typically sits around 67°F at the surface in September, from 92 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
When is Hattie Lake warmest?
Surface water at Hattie Lake is typically warmest in July, 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 Hattie Lake warm enough to swim?
At its typical summer peak of about 68°F, Hattie Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Hattie 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 — 92 readings from 1 monitoring station between 2024 and 2025. 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.