Old Greenwich Weather in September

The climate in Old Greenwich during September can be summarized as mild and damp.

September is in the fall / autumn in Old Greenwich and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 12°C (53°F) is normal.

On average September is the 6th driest month of the year in Old Greenwich with around 100mm 3.9 inches of rain making it a 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 7.8 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 Old Greenwich in September 2024.