Swift Lake Water Temperature
Swift Lake in Cass County, Minnesota typically sits around 51°F at the surface in October — warmest in Jul (~66°F) and coldest in May (~51°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 (51°F) to its warmest (66°F).
Typical surface water temperature by month, from 534 field readings (2011–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Swift Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Swift Lake water quality: clarity, algae, phosphorus, depth, fish species, and current advisories, all on one page.
Water temperatures at nearby Minnesota lakes
Summer average ~69°F
Summer average ~66°F
Summer average ~69°F
Summer average ~71°F
Summer average ~72°F
Summer average ~64°F
Explore water temperatures
Where to stay near Swift Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Swift Lake — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Swift Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Swift Lake?
Get lake water-quality updates plus the best cabin & lodging deals near Swift Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Swift Lake?
Swift Lake typically sits around 51°F at the surface in October, from 534 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
When is Swift Lake warmest?
Surface water at Swift Lake is typically warmest in July, reaching about 66°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 Swift Lake warm enough to swim?
At its typical summer peak of about 65°F, Swift Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Swift 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 — 534 readings from 2 monitoring stations between 2011 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.