South San Francisco, CA Weather & Growing Conditions
Today
73°F
Sunny
Sunny. High near 73, with temperatures falling to around 70 in the afternoon. West wind 6 to 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 6 to 20 mph W | 0% |
| Tonight | 58°F | Mostly Cloudy | 9 to 18 mph W | 1% |
| Sunday | 69°F | Mostly Cloudy | 9 to 16 mph W | 3% |
| Sunday Night | 59°F | Mostly Cloudy | 8 to 16 mph W | 3% |
| Monday | 71°F | Mostly Sunny | 8 to 17 mph WSW | 1% |
| Monday Night | 58°F | Partly Cloudy | 7 to 17 mph WSW | 1% |
| Tuesday | 72°F | Mostly Sunny | 7 to 13 mph WSW | 0% |
| Tuesday Night | 58°F | Partly Cloudy | 2 to 10 mph WSW | 0% |
| Wednesday | 75°F | Sunny | 2 to 9 mph SW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 0 to 9 mph WSW | 0% |
| Thursday | 77°F | Sunny | 0 to 10 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 5 to 10 mph WSW | 0% |
| Friday | 72°F | Mostly Sunny | 5 to 13 mph WSW | 0% |
| Friday Night | 59°F | Partly Cloudy | 5 to 13 mph WSW | 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 Sep 19, 2026.