Hāna Weather in September

The climate in Hāna during September can be summarized as warm, humid and very wet.

September is in the fall / autumn in Hāna and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (78°F), whilst at night 17°C (62°F) is normal.

On average September is the driest month of the year in Hāna with around 216mm 8.5 inches of rain making it a very wet time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 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 Hāna in September 2025.