Chicago Weather in October

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

October is in the fall / autumn in Chicago and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (63°F), whilst at night 6°C (43°F) is normal.

On average October is the 5th driest month of the year in Chicago with around 68mm 2.7 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 6.7 hours of sunshine per day.

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 Chicago in October 2025.