Edwardsville Weather in September

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

The climate in Edwardsville during September can be summarized as warm, humid and a little damp.

September is in the fall / autumn in Edwardsville and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 14°C (58°F) is normal.

Edwardsville weather averages (imperial / metric)
Daytime temperature 26.4°C 79.4°F
Nightly temperature 14.3°C 57.7°F
Average temperature 20.3°C 68.5°F
Daily sunshine 8.6 hrs
Avg rainfall 81 mm 3.2 ins
Rainy days 8 days
Sea temperature 21.3°C 70.4°F
Humidity 72%
Windspeed 14kph 9 mph

On average September is the 6th wettest month of the year in Edwardsville with around 81mm 3.2 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 8.6 hours of sunshine per day.

September temperatures in Edwardsville

Edwardsville average temperature in September

September rainfall

Edwardsville average rain in September

September hourly sunshine

Edwardsville 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 Edwardsville 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

Edwardsville weather stats

Edwardsville weather statistics
Hottest month: July 31.1°C 88°F
Driest month: January 47mm 1.9ins
Sunniest month: July 10.8hrs
Coldest month: January 2.6°C 36.7°F
Wettest month: May 105mm 4.1ins
Map showing location of Edwardsville (38.81144, -89.95316) Edwardsville map pin © Google

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