Galena Weather in September

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

The climate in Galena during September can be summarized as mild and damp.

September is in the fall / autumn in Galena and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 10°C (51°F) is normal.

Galena weather averages (imperial / metric)
Daytime temperature 22.9°C 73.2°F
Nightly temperature 10.3°C 50.5°F
Average temperature 16.6°C 61.9°F
Daily sunshine 8.3 hrs
Avg rainfall 103 mm 4.1 ins
Rainy days 9 days
Sea temperature 18°C 64.3°F
Humidity 75%
Windspeed 14.4kph 9 mph

On average September is the 3rd wettest month of the year in Galena with around 103mm 4.1 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 Galena

Galena average temperature in September

September rainfall

Galena average rain in September

September hourly sunshine

Galena 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 Galena 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

Galena weather stats

Galena weather statistics
Hottest month: July 28.5°C 83.3°F
Driest month: February 31mm 1.2ins
Sunniest month: August 10.3hrs
Coldest month: January -3.7°C 25.3°F
Wettest month: August 111mm 4.4ins
Map showing location of Galena (42.41667, -90.42902) Galena map pin © Google

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