Cos Cob Weather in October

The climate in Cos Cob during October can be summarized as mild and a little damp.

October is in the fall / autumn in Cos Cob and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 18°C (64°F), whilst at night 5°C (41°F) is normal.

On average October is the 3rd driest month of the year in Cos Cob with around 99mm 3.9 inches of rain making it a a little damp 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 7.3 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 Cos Cob in October 2025.