Lake Calumet Water Temperature
Lake Calumet in Cook County, Illinois averages about 74°F at the surface in summer — warmest in Jul (~76°F) and coldest in May (~59°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 131 field readings (2014–2021) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Calumet warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Lake Calumet scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Illinois lakes
Summer average ~78°F
Summer average ~78°F
Summer average ~78°F
Summer average ~69°F
Summer average ~78°F
Summer average ~78°F
Explore water temperatures
Where to stay near Lake Calumet
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Lake Calumet — live availability and prices.
Top-rated places to stay near Lake Calumet
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 Lake Calumet?
Get lake water-quality report cards plus the best cabin & lodging deals near Lake Calumet — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Lake Calumet?
Lake Calumet has a typical summer surface temperature of about 74°F. It is usually warmest in July (around 76°F) and coldest in May (around 59°F). These are typical values by month from 131 EPA Water Quality Portal field readings (2014–2021), not a live reading.
When is Lake Calumet warmest?
Surface water at Lake Calumet is typically warmest in July, reaching about 76°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 Lake Calumet warm enough to swim?
At its typical summer peak of about 74°F, Lake Calumet rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Lake Calumet 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 — 131 readings from 1 monitoring station between 2014 and 2021. 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.