Cloudy skies · California
How cloudy is San Francisco?
In a typical year, the sky over San Francisco is mostly cloudy or overcast about 37% of the time, and clear or nearly clear about 47%.
February is the cloudiest month, mostly cloudy about 51% of the time, and September the least cloudy, at about 24%. Across winter, December to February, it’s mostly cloudy about 49% of the time. That makes it the 41st least cloudy sky of the 116 US cities we track.
Last updated
A weather alert is in force here, so no joke today. The National Weather Service has the details.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
The sky at a glance
| Mostly cloudy or overcast, all year | 37% |
|---|---|
| Clear or nearly clear, all year | 47% |
| Mostly cloudy, December to February | 49% |
| Cloudiest month | February, 51% |
| Least cloudy month | September, 24% |
Shares of hours across a typical year. Mostly cloudy means at least five eighths of the sky covered; clear or nearly clear means two eighths or less.
Cities with about the same sky
- Billings, Montana: mostly cloudy about 37% of the time
- Dubuque, Iowa: mostly cloudy about 37% of the time
- Lexington, Kentucky: mostly cloudy about 37% of the time
More about the weather here
Source: NOAA U.S. Climate Normals, hourly, 1991 to 2020, station USW00023234. Airport sensors see cloud up to about 12,000 feet, so thin high cloud isn’t counted.