Lahaina Weather in September

The climate in Lahaina during September can be summarized as hot, humid and reasonably dry.

September is in the fall / autumn in Lahaina and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (83°F), whilst at night 19°C (66°F) is normal.

On average September is the 3rd driest month of the year in Lahaina with around 42mm 1.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.2 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 Lahaina in September 2025.