Anchorage Weather in September

The climate in Anchorage during September can be summarized as cool and reasonably dry.

September is in the fall / autumn in Anchorage and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (55°F), whilst at night 5°C (41°F) is normal.

On average September is the wettest month of the year in Anchorage with around 68mm 2.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.

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