South San Francisco, CA Weather & Growing Conditions
Today
66°F
Light Rain Likely
Rain likely. Mostly cloudy. High near 66, with temperatures falling to around 60 in the afternoon. South southwest wind 9 to 21 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Light Rain Likely | 9 to 21 mph SSW | 66% |
| Tonight | 52°F | Chance Light Rain then Mostly Cloudy | 12 mph E | 38% |
| Wednesday | 66°F | Sunny | 6 to 21 mph N | 3% |
| Wednesday Night | 53°F | Mostly Cloudy | 2 to 21 mph NW | 0% |
| Thursday | 69°F | Patchy Fog then Sunny | 0 to 14 mph NNW | 0% |
| Thursday Night | 53°F | Mostly Clear | 2 to 14 mph NNW | 0% |
| Friday | 71°F | Sunny | 0 to 7 mph NNW | 0% |
| Friday Night | 56°F | Mostly Clear | 1 to 7 mph NNW | 0% |
| Saturday | 71°F | Sunny | 2 to 6 mph NNE | 0% |
| Saturday Night | 57°F | Mostly Clear | 2 to 7 mph NW | 0% |
| Sunday | 70°F | Mostly Sunny | 2 to 7 mph NNW | 0% |
| Sunday Night | 57°F | Partly Cloudy | 2 to 7 mph WNW | 0% |
| Monday | 67°F | Partly Sunny | 2 to 9 mph NW | 1% |
| Monday Night | 57°F | Partly Cloudy | 1 to 9 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South San Francisco, CA
Last spring frost
Dec 29
First fall frost
Dec 26
Growing season
365 days
Hardiness zone
10a
Explore more for South San Francisco, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (1.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.