Wailuku Weather in December

The climate in Wailuku during December can be summarized as warm, humid and wet.

December is in the winter in Wailuku and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a muggy 25°C (77°F), whilst at night 16°C (61°F) is normal.

On average December is the 3rd wettest month of the year in Wailuku with around 155mm 6.1 inches of rain making it a 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 7.1 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 Wailuku in December 2025.