Granite Lake Water Temperature
Granite Lake in Wright County, Minnesota typically sits around 68°F at the surface in September — warmest in Jul (~69°F) and coldest in May (~58°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 205 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Granite Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Granite Lake scored D 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 Granite Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Granite Lake — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Frequently asked questions
What is the water temperature of Granite Lake?
Granite Lake typically sits around 68°F at the surface in September, from 205 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
When is Granite Lake warmest?
Surface water at Granite Lake is typically warmest in July, reaching about 69°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 Granite Lake warm enough to swim?
At its typical summer peak of about 68°F, Granite Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Granite 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 — 205 readings from 1 monitoring station 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.