Saint Louis Weather in October

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

October is in the fall / autumn in Saint Louis and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 21°C (69°F), whilst at night 9°C (47°F) is normal.

On average October is the 3rd driest month of the year in Saint Louis with around 67mm 2.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.4 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 Saint Louis in October 2025.