South San Francisco Weather in December
During December, South San Francisco experiences moderate daytime temperatures of 14°C (57°F) and cooler nights around 7°C (45°F). As the wettest month of the year, expect frequent rainfall.
Rainfall in South San Francisco in December
With frequent rain showers this month, having an umbrella on hand will keep you dry. Typically, about 13 days will experience rainfall, with an average of 114 mm (4.5 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in South San Francisco in December
December in South San Francisco sees highs of 14°C (57°F) and lows of 7°C (45°F) overnight. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 7°C (45°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. December is characterized by some of the mildest temperatures of the year.
Sunshine in South San Francisco in December
The area experiences a moderate amount of sunshine, with approximately 160 hours of sunlight expected. This means a decent mix of sun and overcast.
Wind Speed in South San Francisco in December
Average wind speeds reach 3 m/s (6 knots) in December, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.
Average water temperature in December
The water temperature is 13°C (55°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.December in South San Francisco has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our South San Francisco's climate page.
South San Francisco Temperature in December
Min Temperature
7°C (45°F)
Max Temperature
14°C (57°F)
Water Temperature
13°C (55°F) *
Chance of Rain
44%
Precipitation
114 mm (4.5 in)
Rainy days
13 days
Humidity
78% *
Windspeed
3 m/s (6 knots) *
Sunshine
160 hours *
Percentage Sunshine
54% *
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in South San Francisco in December
Pack for changing conditions in South San Francisco in December. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 13°C (55°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in South San Francisco in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our South San Francisco's climate page.
