Lewes Weather in September

The climate in Lewes during September can be summarized as warm, humid and a little damp.

September is in the fall / autumn in Lewes and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (78°F), whilst at night 15°C (59°F) is normal.

On average September is the 6th wettest month of the year in Lewes with around 86mm 3.4 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 8.2 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 Lewes in September 2025.