San Francisco, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Francisco, a city in Marin County, California.
Overnight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. Northwest wind around 20 mph, with gusts as high as 24 mph.
7-day forecast for San Francisco
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Mostly Cloudy | 20 mph NW | 0% |
| Saturday | 62°F | Mostly Sunny | 15 to 18 mph NW | 0% |
| Saturday Night | 58°F | Mostly Cloudy | 20 mph NW | 0% |
| Sunday | 61°F | Mostly Cloudy | 15 to 20 mph NW | 0% |
| Sunday Night | 58°F | Mostly Cloudy | 16 mph NW | 2% |
| Monday | 61°F | Mostly Cloudy | 8 to 14 mph NW | 2% |
| Monday Night | 58°F | Mostly Cloudy | 10 mph NW | 2% |
| Tuesday | 62°F | Partly Sunny | 8 to 14 mph NW | 2% |
| Tuesday Night | 58°F | Partly Cloudy | 14 mph NW | 0% |
| Wednesday | 64°F | Mostly Sunny | 6 to 14 mph NNW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 13 mph NW | 0% |
| Thursday | 64°F | Mostly Sunny | 7 to 12 mph NW | 0% |
| Thursday Night | 59°F | Mostly Cloudy | 13 mph NW | 0% |
| Friday | 63°F | Mostly Sunny | 9 to 13 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for San Francisco (37.727, -123.032). Updated through the day.
Growing snapshot for San Francisco
Last spring frost
Jan 11
First fall frost
Dec 21
Growing season
349 days
Hardiness zone
9b
More local growing data for San Francisco: nearby ZIP 94956 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Rafael Civic Ctr, Ca (15.4 mi from San Francisco). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.