Cambridge Weather in September

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

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

September is in the fall / autumn in Cambridge and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (76°F), whilst at night 12°C (53°F) is normal.

Cambridge weather averages (imperial / metric)
Daytime temperature 24.5°C 76.1°F
Nightly temperature 11.7°C 53.1°F
Average temperature 18.1°C 64.6°F
Daily sunshine 8.1 hrs
Avg rainfall 97 mm 3.8 ins
Rainy days 9 days
Sea temperature 18.8°C 65.8°F
Humidity 73%
Windspeed 14.4kph 9 mph

On average September is the 6th wettest month of the year in Cambridge with around 97mm 3.8 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 8.1 hours of sunshine per day.

September temperatures in Cambridge

Cambridge average temperature in September

September rainfall

Cambridge average rain in September

September hourly sunshine

Cambridge 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 Cambridge 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

Cambridge weather stats

Cambridge weather statistics
Hottest month: July 29.6°C 85.3°F
Driest month: February 34mm 1.3ins
Sunniest month: July 10.6hrs
Coldest month: January -2.1°C 28.2°F
Wettest month: July 111mm 4.4ins
Map showing location of Cambridge (41.30365, -90.1929) Cambridge map pin © Google

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