Springfield Weather in September

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

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

September is in the fall / autumn in Springfield and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 13°C (56°F) is normal.

Springfield weather averages (imperial / metric)
Daytime temperature 26.1°C 79°F
Nightly temperature 13.1°C 55.6°F
Average temperature 19.6°C 67.3°F
Daily sunshine 8.8 hrs
Avg rainfall 85 mm 3.3 ins
Rainy days 8 days
Sea temperature 20.5°C 68.8°F
Humidity 72%
Windspeed 14.4kph 9 mph

On average September is the 6th wettest month of the year in Springfield with around 85mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.8 hours of sunshine per day.

September temperatures in Springfield

Springfield average temperature in September

September rainfall

Springfield average rain in September

September hourly sunshine

Springfield 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 Springfield 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

Springfield weather stats

Springfield weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: January 42mm 1.7ins
Sunniest month: July 11hrs
Coldest month: January 0.5°C 32.9°F
Wettest month: May 98mm 3.9ins
Map showing location of Springfield (39.80172, -89.64371) Springfield map pin © Google

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