The highest day temperature in December 2025 was 61°F. The lowest night temperature was 44°F. The average values for day and night temperatures during December were 53.8°F и 50.2°F respectivly.

The average sea surface temperature in December 2025 for Sausalito was 54.9°F. The maximum and minimum values were 52.8°F and 57.4°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Sausalito is 1.4 in. It makes december the most rainy month of the year.

The average wind speed in December is 7.2 mph. It makes December one of the most windless months of the year for Sausalito.

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 Sausalito in December is 5.3 hours.