Johnson Lake Water Temperature
Johnson Lake in Beltrami County, Minnesota averages about 73°F at the surface in summer — warmest in Jul (~75°F) and coldest in Jan (~32°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 70 field readings (2010–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Johnson Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Johnson Lake scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Minnesota lakes
Summer average ~73°F
Summer average ~73°F
Summer average ~73°F
Summer average ~73°F
Summer average ~73°F
Summer average ~76°F
Explore water temperatures
Where to stay near Johnson Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Johnson Lake — live availability and prices.
Top-rated places to stay near Johnson Lake
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 Johnson Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Johnson Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Johnson Lake?
Johnson Lake has a typical summer surface temperature of about 73°F. It is usually warmest in July (around 75°F) and coldest in January (around 32°F). These are typical values by month from 70 EPA Water Quality Portal field readings (2010–2025), not a live reading.
When is Johnson Lake warmest?
Surface water at Johnson 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 Johnson Lake warm enough to swim?
At its typical summer peak of about 73°F, Johnson Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Johnson 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 — 70 readings from 2 monitoring stations 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.