South San Francisco, CA Weather & Growing Conditions
Today
79°F
Sunny
Sunny. High near 79, with temperatures falling to around 77 in the afternoon. Northwest wind 3 to 15 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 3 to 15 mph NW | 1% |
| Tonight | 58°F | Mostly Clear | 5 to 14 mph WSW | 1% |
| Wednesday | 78°F | Sunny | 5 to 14 mph WSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 1 to 14 mph WSW | 0% |
| Thursday | 77°F | Mostly Sunny | 0 to 15 mph SW | 0% |
| Thursday Night | 59°F | Partly Cloudy | 5 to 15 mph W | 0% |
| Friday | 79°F | Sunny | 3 to 12 mph W | 0% |
| Friday Night | 60°F | Mostly Clear | 2 to 10 mph WSW | 0% |
| Saturday | 74°F | Sunny | 2 to 12 mph WSW | 0% |
| Saturday Night | 61°F | Mostly Clear | 7 to 12 mph WSW | 0% |
| Sunday | 71°F | Sunny | 7 to 14 mph WSW | 0% |
| Sunday Night | 59°F | Mostly Clear | 9 to 14 mph WSW | 0% |
| Monday | 69°F | Mostly Sunny | 9 to 15 mph WSW | 0% |
| Monday Night | 59°F | Partly Cloudy | 8 to 15 mph SW | 0% |
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 Aug 4, 2026.