Morro Bay Weather in December

The climate in Morro Bay during December can be summarized as mild and a little damp.

December is in the winter in Morro Bay and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 5°C (40°F) is normal.

On average December is the 3rd wettest month of the year in Morro Bay with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.5 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 Morro Bay in December 2025.