Unalaska Weather in September

The climate in Unalaska during September can be summarized as cool and damp.

September is in the fall / autumn in Unalaska and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 11°C (51°F), whilst at night 6°C (43°F) is normal.

On average September is the 3rd wettest month of the year in Unalaska with around 100mm 3.9 inches of rain making it a damp time to visit. This rainfall is typically spread over 21 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.2 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 Unalaska in September 2024.