Unalaska Weather in December

The climate in Unalaska during December can be summarized as cool and a little damp.

December is in the winter in Unalaska and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a cold 3°C (38°F), whilst at night -2°C (29°F) is normal.

On average December is the 4th wettest month of the year in Unalaska with around 94mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 21 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 Unalaska in December 2025.