Visiting San Francisco in December means experiencing the city during its coolest and wettest month. While winter lows rarely drop below freezing, daytime temperatures hover comfortably in the mid-50s to low 60s Fahrenheit, making it a crisp and crowd-free time to explore if you know what to expect.
December marks the heart of the rainy season in Northern California. You'll encounter a mix of bright winter sunshine, sudden heavy downpours, and moody coastal fog rolling in from the Pacific. Unlike snowy winter destinations, San Francisco offers mild days that call for smart layers rather than heavy snow gear.
What to Expect from December Weather in San Francisco
Understanding the local climate patterns helps you pack the right gear and plan your itinerary without getting caught in a sudden downpour.
Temperatures and Daily Patterns
Average daily temperatures range from a chilly 48 degrees Fahrenheit at night to around 57 degrees Fahrenheit during the afternoon. While these numbers sound mild, wind off the ocean and damp air create a noticeable wind chill. When the sun shines, it feels warm enough for a light jacket, but the moment clouds roll in or the sun sets, temperatures drop quickly.
Rainfall and Storm Systems
December is one of the wettest months of the year, averaging around 4 to 5 inches of precipitation. Rain typically arrives in multi-day storm systems rather than daily drizzles. When a storm clears, it leaves behind some of the clearest, most vibrant blue skies and crisp air of the entire year, offering incredible visibility from viewpoints like Twin Peaks or the National Park Service lands around the Golden Gate.
Daylight and Sunset Times
Winter solstice occurs this month, meaning December has the shortest days of the year. Sunrise happens around 7:00 AM, and sunset takes place near 5:00 PM. This leaves just under ten hours of daylight, so you'll want to schedule outdoor sightseeing earlier in the day.
How to Prepare: Packing and Gear
Packing for San Francisco in December requires versatility. The golden rule for local weather is layering.
- The Three-Layer System: Pack a moisture-wicking base layer, a warm fleece or wool mid-layer, and a wind-resistant, waterproof outer shell.
- Footwear: Leave canvas sneakers at home. Bring comfortable, waterproof walking shoes or boots because city hills get slick when wet, and puddles form quickly in crosswalks.
- Wind Protection: A sturdy jacket with a hood is far more useful than an umbrella. Strong coastal gusts frequently turn umbrellas inside out, rendering them useless on windy corners or bridges.
Best Neighborhood Microclimates to Navigate
San Francisco’s famous topography creates distinct microclimates. Weather conditions in one neighborhood often bear no resemblance to another just a few miles away.
The Western neighborhoods like Ocean Beach and the Outer Sunset bear the brunt of direct ocean winds and heavy fog. Meanwhile, the Mission District and Potrero Hill block incoming winds with their geography, often enjoying sunnier and warmer afternoons. When planning outdoor activities, check localized forecasts rather than relying on a single citywide weather app.
Top Activities and Holiday Attractions
December brings festive energy to the city, offering plenty of ways to warm up indoors or enjoy crisp outdoor sights.
Holiday Lights and Ice Skating
Union Square transforms into a winter hub featuring the annual holiday ice rink and a massive decorated tree. Cable cars run their regular routes, carrying passengers past decorated storefronts in downtown shopping districts.
Indoor Cultural Escapes
When rain moves in, the city's world-class museums provide dry shelter. Spend an afternoon exploring the interactive exhibits at the Exploratorium along the Embarcadero or view the marine life collections at the California Academy of Sciences in Golden Gate Park.
Coastal Walks Between Storms
If you catch a dry day, walking the coastal trails provides dramatic storm-watching opportunities. Huge ocean swells crash against the cliffs at Lands End, and the post-rain air offers unobstructed views of the Marin Headlands.
Frequently Asked Questions
Does it ever snow in San Francisco in December?
Snow in San Francisco is exceptionally rare. The last measurable snowfall occurred in 1976. Winter precipitation comes exclusively as rain due to the warming influence of the Pacific Ocean.
Are outdoor tours and Alcatraz trips still running in December?
Yes, ferries to Alcatraz Island and most outdoor boat tours operate year-round. However, morning sailings can face delays or cancellations if heavy fog or high winds create hazardous marine conditions. Always check tour operator schedules before heading to the piers.
How crowded is San Francisco during December?
Aside from the peak holiday weeks around Christmas and New Year's Eve, December sees fewer tourists than the busy summer months. You'll experience shorter lines at top restaurants, easier reservations, and a more relaxed pace throughout the city.
What is the best way to get around during rainy days?
Public transit operated by the San Francisco Municipal Transportation Agency includes an extensive network of buses, light rail, and historic streetcars that keep you out of the rain. Rideshares and taxis are also widely available, though surge pricing applies during heavy downpours.
