The highest day temperature in December 2025 was 61°F. The lowest night temperature was 37°F. The average values for day and night temperatures during December were 51.1°F и 46.0°F respectivly.

The average sea surface temperature in December 2025 for Seaside was 52.5°F. The maximum and minimum values were 51.0°F and 53.8°F respectively.

Most of the days in December are gloomy but you can also expect sunny days.

Precipitation total in December for Seaside is 2.4 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 10.1 mph. It makes December the most windy month of the year for Seaside.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Seaside in December is 2.5 hours.