Grand Calumet Lagoon Lake Water Temperature
Grand Calumet Lagoon Lake in Lake County, Indiana averages about 78°F at the surface in summer — warmest in Aug (~80°F) and coldest in Sep (~68°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 19 field readings (2013–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Grand Calumet Lagoon Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Grand Calumet Lagoon Lake scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Indiana lakes
Summer average ~78°F
Summer average ~79°F
Summer average ~78°F
Summer average ~75°F
Summer average ~76°F
Summer average ~81°F
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Frequently asked questions
What is the water temperature of Grand Calumet Lagoon Lake?
Grand Calumet Lagoon Lake has a typical summer surface temperature of about 78°F. It is usually warmest in August (around 80°F) and coldest in September (around 68°F). These are typical values by month from 19 EPA Water Quality Portal field readings (2013–2022), not a live reading.
When is Grand Calumet Lagoon Lake warmest?
Surface water at Grand Calumet Lagoon Lake is typically warmest in August, reaching about 80°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 Grand Calumet Lagoon Lake warm enough to swim?
At its typical summer peak of about 78°F, Grand Calumet Lagoon Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Grand Calumet Lagoon 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 — 19 readings from 3 monitoring stations between 2013 and 2022. 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.