Swamp Lake Water Temperature
Swamp Lake in Chisago County, Minnesota typically sits around 66°F at the surface in September — warmest in Aug (~75°F) and coldest in May (~65°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Column height runs from this lake’s coldest month (65°F) to its warmest (75°F).
Typical surface water temperature by month, from 37 field readings (2017–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Swamp Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Swamp Lake water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
Water temperatures at nearby Minnesota lakes
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Where to stay near Swamp Lake
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Frequently asked questions
What is the water temperature of Swamp Lake?
Swamp Lake typically sits around 66°F at the surface in September, from 37 EPA Water Quality Portal field readings (2017–2025). That is a typical value for the month, not a live reading.
When is Swamp Lake warmest?
Surface water at Swamp Lake is typically warmest in August, 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 Swamp Lake warm enough to swim?
At its typical summer peak of about 73°F, Swamp Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Swamp 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 — 37 readings from 1 monitoring station between 2017 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.