Rock Island Weather in October

What's the weather like in Rock Island (Illinois) in October 2025?

The climate in Rock Island during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Rock Island and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 19°C (66°F), whilst at night 6°C (43°F) is normal.

Rock Island weather averages (imperial / metric)
Daytime temperature 18.6°C 65.5°F
Nightly temperature 6.2°C 43.2°F
Average temperature 12.4°C 54.3°F
Daily sunshine 7 hrs
Avg rainfall 66 mm 2.6 ins
Rainy days 9 days
Sea temperature 14.4°C 57.9°F
Humidity 69%
Windspeed 16.6kph 10 mph

On average October is the 6th driest month of the year in Rock Island with around 66mm 2.6 inches of rain making it a reasonably dry 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 7 hours of sunshine per day.

October temperatures in Rock Island

Rock Island average temperature in October

October rainfall

Rock Island average rain in October

October hourly sunshine

Rock Island average rain in October

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 October 2025.

Other monthly averages

Best places to visit in October

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