Weather in Tomales Bay, Marin County, United States in December

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Visiting Tomales Bay, Marin County, United States in December

The weather in December is noticeably cooler than the previous month. December has average maximum temperatures of 15°C (58°F) which is a little too chilly for sunbathing. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day. It is not a good time for sunbathing in Tomales Bay.

December has total rainfall of 12cm (4.7inches) making it quite dry with only moderate showers. There are just 8.7 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days.

Sea temperatures are a cold 15°C (59°F). December is too cold for swimming in Tomales Bay for any length of time, unless you have a wetsuit. The sea temperature in December is slightly cooler than the previous month.

December brings cooler weather and more frequent rain showers, making it less suitable for sunbathing and swimming. However, beach walks and exploring the surrounding areas are still enjoyable during this month. Water sports like kayaking and paddleboarding may be possible, but snorkeling and diving are less recommended due to cooler water temperatures. Consider visiting Tomales Bay in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for December.

Can you sunbathe in Tomales Bay in December?

No, December is not a good time for sunbathing in Tomales Bay.

December has average maximum temperatures of 15°C (58°F) which is a little too chilly for sunbathing. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day. December has total rainfall of 12cm (4.7inches) making it quite dry with only moderate showers. There are just 8.7 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days.

More about December temperature and sunshine.

Can you swim in Tomales Bay in December?

No, December is too cold for swimming in Tomales Bay for any length of time, with the sea water at 15°C (59°F), unless you have a wetsuit.

More about December sea temperatures.

Is December a good time to holiday in Tomales Bay?

No, December is not a good time for a holiday in Tomales Bay.

December has average maximum temperatures of 15°C (58°F) which is a little too chilly for sunbathing. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day. December has total rainfall of 12cm (4.7inches) making it quite dry with only moderate showers. There are just 8.7 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days. It is not a good time for sunbathing in Tomales Bay. Sea temperatures are a cold 15°C (59°F). December is too cold for swimming in Tomales Bay for any length of time, unless you have a wetsuit.

More about the December temperatures and sunshine.

Is Tomales Bay warm in December?

No, Tomales Bay is a little too chilly for sunbathing in December.

The average maximum temperature in Tomales Bay in December is 15°C (58°F). The average maximum temperature is 18°C (64°) in the previous month and 16°C (60°F) in the next month.

The average temperature in Tomales Bay in December is 8°C (47°F). The average temperature is 11°C (52°F) in the previous month and 8°C (46°F) in the next month.

More info about the December temperatures and sunshine.

How sunny is Tomales Bay in December?

The average day light hours per day in Tomales Bay in December are 9.5. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day.

More about December sunshine.

Crowds in Tomales Bay in December

December is one of the least crowded months at Tomales Bay beach, with cold weather and people focusing on holiday celebrations. The beach is quiet and peaceful during this time, with minimal visitors.

Temperature in Tomales Bay in December

The weather in December is noticeably cooler than the previous month. The average maximum temperature in Tomales Bay in December is 15°C (58°F). The average maximum temperature is 18°C (64°F) in the previous month and 16°C (60°F) in the next month.

The average temperature in Tomales Bay in December is 8°C (47°F). The average temperature is 11°C (52°F) in the previous month and 8°C (46°F) in the next month.

The average minimum temperature in Tomales Bay in December is 2°C (36°F). The minimum temperature is 5°C (41°F) in the previous month and 1°C (34°F) in the next month.

Sunshine in Tomales Bay in December

The days in December are slightly shorter than the previous month. December has fewer hours of sunshine than the previous month. During December the average day light hours are 9.5 per day in Tomales Bay. The sunshine percentage is 54% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day.

The ultraviolet index in Tomales Bay in December is typically 2.1 during December. An ultraviolet index reading of 0 to 2 indicates low danger from the sun's UV rays for the average person. Most people will be able to spend several hours in the sun with out a problem, however unprotected skin risks burning in less than 1 hour. Wear sunglasses on bright days. Only those that burn easily will need to apply sunscreen. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Tomales Bay in December

The average sea water temperature in Tomales Bay in December is 15.2°C (59.4°F) which is cold for swimming, a full wet suit is required to spend any length of time in the sea. The sea temperature in December is slightly cooler than the previous month.

Rainfall in Tomales Bay in December

December weather is wetter than the previous month. December has a few more days of rain than the previous month. The average total rainfall in Tomales Bay in December is 12cm (4.7inches) and on average there are 8.7 rainy days in December making it a quite rainy time to visit the beach.

Humidity in Tomales Bay in December

The maximum dew point (an indicator of humidity) in Tomales Bay in December is 9°C (48°F) which is a bit dry for some. The dew point is 10°C (50°F) in the previous month and 7°C (7°F) in the next month.

The average maximum relative humidity in Tomales Bay in December is typically 98.6%. The maximum relative humidity is 97.9% in the previous month and 99.6% in the next month.

The average relative humidity in Tomales Bay in December is typically 85.4%. The average relative humidity is 81.7% in the previous month and 81.1% in the next month.

Wind Speed in Tomales Bay in December

The average maximum wind speed in Tomales Bay in December is typically 18KM/H (11MPH). The average maximum wind speed is 19KM/H (12MPH) in the previous month and 18KM/H (11MPH) in the next month.

The average wind speed in Tomales Bay in December is typically 5KM/H (3MPH). The average wind speed is 6KM/H (3MPH) in the previous month and 5KM/H (3MPH) in the next month.

The average wind direction in Tomales Bay in December is from the South-Southwest.

Monthly Averages

Suggested Beaches in December

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Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.