Naples Weather in September

The climate in Naples during September can be summarized as hot, humid and very wet.

September is in the fall / autumn in Naples and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 23°C (74°F) is normal.

On average September is the 3rd wettest month of the year in Naples with around 206mm 8.1 inches of rain making it a very wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.

On the flip side this corresponds to an average of 9 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 Naples in September 2025.