Rock Island Weather in September

What's the weather like in Rock Island (Illinois) in September 2024?

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

September is in the fall / autumn in Rock Island and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 12°C (54°F) is normal.

Rock Island weather averages (imperial / metric)
Daytime temperature 24.9°C 76.8°F
Nightly temperature 12.3°C 54.1°F
Average temperature 18.6°C 65.5°F
Daily sunshine 8.1 hrs
Avg rainfall 96 mm 3.8 ins
Rainy days 9 days
Sea temperature 18.8°C 65.8°F
Humidity 73%
Windspeed 14.4kph 9 mph

On average September is the 4th wettest month of the year in Rock Island with around 96mm 3.8 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 8.1 hours of sunshine per day.

September temperatures in Rock Island

Rock Island average temperature in September

September rainfall

Rock Island average rain in September

September hourly sunshine

Rock Island 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 Rock Island in September 2024.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Rock Island weather stats

Rock Island weather statistics
Hottest month: July 29.9°C 85.8°F
Driest month: February 26mm 1ins
Sunniest month: July 10.6hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: July 114mm 4.5ins
Map showing location of Rock Island (41.50948, -90.57875) Rock Island map pin © Google

Locations nearby

Top United States locations