Macomb Weather in September

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

The climate in Macomb during September can be summarized as warm and damp.

September is in the fall / autumn in Macomb and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (78°F), whilst at night 12°C (54°F) is normal.

Macomb weather averages (imperial / metric)
Daytime temperature 25.4°C 77.7°F
Nightly temperature 12°C 53.6°F
Average temperature 18.7°C 65.7°F
Daily sunshine 8.3 hrs
Avg rainfall 107 mm 4.2 ins
Rainy days 9 days
Sea temperature 19.6°C 67.2°F
Humidity 72%
Windspeed 14.4kph 9 mph

On average September is the 2nd wettest month of the year in Macomb with around 107mm 4.2 inches of rain making it a 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 Macomb

Macomb average temperature in September

September rainfall

Macomb average rain in September

September hourly sunshine

Macomb 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 Macomb 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

Macomb weather stats

Macomb weather statistics
Hottest month: July 30.3°C 86.5°F
Driest month: February 38mm 1.5ins
Sunniest month: July 10.7hrs
Coldest month: January -0.5°C 31.1°F
Wettest month: July 110mm 4.3ins
Map showing location of Macomb (40.45921, -90.6718) Macomb map pin © Google

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