Yarmouth Weather in September

The climate in Yarmouth during September can be summarized as mild and a little damp.

September is in the fall / autumn in Yarmouth and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 9°C (49°F) is normal.

On average September is the 3rd driest month of the year in Yarmouth with around 90mm 3.5 inches of rain making it a a little damp 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 6.4 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 Yarmouth in September 2025.