Seaside Weather in December

The climate in Seaside during December can be summarized as mild and damp.

December is in the winter in Seaside and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 18°C (64°F), whilst at night 6°C (43°F) is normal.

On average December is the 6th driest month of the year in Seaside with around 107mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.1 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 Seaside in December 2025.