Calumet City Weather in September

What's the weather like in Calumet City (Illinois) in September 2025?

The climate in Calumet City during September can be summarized as warm and a little damp.

September is in the fall / autumn in Calumet City and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 12°C (54°F) is normal.

Calumet City weather averages (imperial / metric)
Daytime temperature 24°C 75.2°F
Nightly temperature 12°C 53.6°F
Average temperature 18°C 64.4°F
Daily sunshine 8.3 hrs
Avg rainfall 91 mm 3.6 ins
Rainy days 9 days
Sea temperature 19.7°C 67.5°F
Humidity 72%
Windspeed 15.1kph 9 mph

On average September is the 5th wettest month of the year in Calumet City with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.3 hours of sunshine per day.

September temperatures in Calumet City

Calumet City average temperature in September

September rainfall

Calumet City average rain in September

September hourly sunshine

Calumet City average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Calumet City in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Calumet City weather stats

Calumet City weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 37mm 1.5ins
Sunniest month: July 11hrs
Coldest month: January -1.4°C 29.5°F
Wettest month: June 101mm 4ins
Map showing location of Calumet City (41.61559, -87.52949) Calumet City map pin © Google

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