Williamsport Weather in September

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

September is in the fall / autumn in Williamsport and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 11°C (51°F) is normal.

On average September is the 6th wettest month of the year in Williamsport with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.6 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 Williamsport in September 2024.