Galesburg Weather in September

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

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

September is in the fall / autumn in Galesburg and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 12°C (53°F) is normal.

Galesburg weather averages (imperial / metric)
Daytime temperature 24.9°C 76.8°F
Nightly temperature 11.9°C 53.4°F
Average temperature 18.4°C 65.1°F
Daily sunshine 8.2 hrs
Avg rainfall 99 mm 3.9 ins
Rainy days 9 days
Sea temperature 19.6°C 67.2°F
Humidity 73%
Windspeed 14.4kph 9 mph

On average September is the 4th wettest month of the year in Galesburg with around 99mm 3.9 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 8.2 hours of sunshine per day.

September temperatures in Galesburg

Galesburg average temperature in September

September rainfall

Galesburg average rain in September

September hourly sunshine

Galesburg 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 Galesburg 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

Galesburg weather stats

Galesburg weather statistics
Hottest month: July 29.9°C 85.8°F
Driest month: February 36mm 1.4ins
Sunniest month: July 10.6hrs
Coldest month: January -1.2°C 29.8°F
Wettest month: July 112mm 4.4ins
Map showing location of Galesburg (40.94782, -90.37124) Galesburg map pin © Google

Locations nearby

Top United States locations