Winter Storm Warnings in San Francisco, California
San Francisco sits at the edge of the Pacific on a narrow peninsula, where the ocean keeps temperatures remarkably mild year-round. Analyzing weather records across 13 years from 2012 through 2024, the city averaged exactly 0.0 inches (0.0 cm) of snowfall annually. There are no snowiest months to speak of, no heavy-snow days on record during that span, and no major-snow days either. Winter overnight lows average a relatively comfortable 45.2°F (7.3°C), rarely approaching the kind of cold that produces frozen precipitation.
Given this climate, a winter storm warning is essentially a non-event in San Francisco in the traditional sense. The city may occasionally see frost in elevated neighborhoods like Twin Peaks or the Sunset District, and heavy rain combined with strong coastal winds can create genuinely hazardous driving conditions — but accumulating snow is effectively absent from the local experience.
It is worth noting that winter storm warning thresholds are set regionally by the National Weather Service and vary considerably across the country. The criteria that trigger a warning in Denver or Minneapolis would be far stricter than anything San Francisco would ever need. Residents traveling inland to the Sierra Nevada, however, should check local advisories carefully, as conditions there change dramatically within just a few hours’ drive.
| Years analyzed | 13 winters (2012–2024) |
|---|---|
| Avg. annual snowfall | 0 in (0 cm) |
| Snowiest months | None — measurable snow is rare here |
| Avg. winter overnight low | 45.2°F (7.3°C) |
| Heavy-snow days per year | 0 |
Climatology figures are approximate estimates for the period shown and may differ from official local records.
Watch vs warning: a winter storm watch means a major storm is possible in San Francisco within 12–48 hours (be prepared); a winter storm warning means it is happening or about to (take action now). For full definitions, see the complete winter storm warning guide.
San Francisco winter storm FAQ
Is there a winter storm warning in San Francisco right now?
The live status at the top of this page shows whether a winter storm warning, watch, or advisory is currently in effect for San Francisco, California. It checks live forecast and alert data automatically and refreshes every time the page loads.
Does San Francisco get winter storm warnings often?
San Francisco rarely sees measurable snow, so winter storm warnings are uncommon; even a light snow or ice event can be highly disruptive here. The frequency varies year to year with the track of major storm systems.
How much snow triggers a winter storm warning in San Francisco?
There is no single national trigger: warning criteria are set by each local National Weather Service office, ranging from a couple of inches of snow in areas where snow is rare up to 6 inches or more in snow-belt regions, and significant ice accumulation can warrant a warning on its own. In a lower-snow area like San Francisco, warnings can be issued for amounts snowier regions would shrug off.
What should I do during a winter storm warning in San Francisco?
Avoid travel if possible, stay indoors and keep warm, prepare for power outages, keep an emergency kit, and check on elderly or vulnerable neighbours. Follow guidance from California authorities and the National Weather Service (NWS).
Winter storm warnings in nearby locations
- Winter storm warning in Sacramento, CA
- Winter storm warning in South Lake Tahoe, CA
- Winter storm warning in Redding, CA
- Winter storm warning in Carson City, NV
- Winter storm warning in Reno, NV
- Winter storm warning in Los Angeles, CA
See all locations, read the latest winter weather news, or the full winter storm warning guide. Definitions follow the National Weather Service (NWS) criteria; thresholds vary by region.