North Long Lake Water Temperature
North Long Lake in Ramsey County, Minnesota averages about 72°F at the surface in summer — warmest in Jul (~75°F) and coldest in Mar (~39°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 443 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is North Long Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? North Long Lake scored F 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 North Long Lake?
North Long Lake has a typical summer surface temperature of about 72°F. It is usually warmest in July (around 75°F) and coldest in March (around 39°F). These are typical values by month from 443 EPA Water Quality Portal field readings (2010–2025), not a live reading.
When is North Long Lake warmest?
Surface water at North Long Lake is typically warmest in July, reaching about 75°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 North Long Lake warm enough to swim?
At its typical summer peak of about 72°F, North Long Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this North Long 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 — 443 readings from 1 monitoring station between 2010 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.