Port Townsend Weather in September

The climate in Port Townsend during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Port Townsend and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 10°C (50°F) is normal.

On average September is the 3rd driest month of the year in Port Townsend with around 34mm 1.3 inches of rain making it a reasonably dry 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 7.5 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 Port Townsend in September 2025.