Wailua Weather in September

The climate in Wailua during September can be summarized as hot, humid and very wet.

September is in the fall / autumn in Wailua and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 22°C (71°F) is normal.

On average September is the 2nd driest month of the year in Wailua with around 218mm 8.6 inches of rain making it a very wet time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.5 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 Wailua in September 2025.