San Francisco weather in January 2026

January mornings in San Francisco arrive grey and damp, with temperatures hovering around 7.9°C (46°F) and climbing only to 14.2°C (57°F) by afternoon. You'll see roughly 110mm of rainfall spread across about 10 rainy days—enough to keep the city's famous hills slick and the bay moody. Despite the wet spells, the city still catches 7.1 hours of sunshine daily, often in sharp, clear bursts that make the Golden Gate Bridge suddenly gleam. It's a month of contrast: heavy jackets give way to blue sky within hours, then fog rolls back in by evening.

The city feels quieter in January than it does in summer. Holiday visitors have left, and locals reclaim their neighborhoods. The Mission and North Beach are busy enough on weekends, but weekday mornings on the Embarcadero belong almost entirely to joggers and fishermen. Restaurants and hotels drop their December prices noticeably, making this one of the best months for travelers on a budget. You'll find shorter lines at museums and galleries, and parking—while never easy—becomes slightly less of a nightmare. Fog can roll in thick enough to obscure the bridge by 3 p.m., so plan indoor activities for late afternoons.

Historical data from the past decade shows January in San Francisco has remained remarkably stable. Temperatures rarely dip below 5°C (41°F) or spike above 18°C (64°F). Rainfall has been consistent at around 100–120mm most years, with 2026 tracking close to that average. Climate patterns suggest no significant departure from the norm, so pack accordingly without expecting surprises.

January suits photographers chasing moody light, budget travelers seeking lower prices, and anyone who appreciates solitude over crowds. Families can still explore comfortably, though outdoor activities like hiking Twin Peaks or walking the Lands End trail are best saved for rare sunny afternoons. Book indoor experiences—museums, galleries, bookshops—around the inevitable rainy mornings. For 2026 travelers, this is prime time to experience San Francisco as locals do, without the summer crush.