San Mateo, CA Weather & Growing Conditions
Overnight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. West southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Mostly Cloudy | 5 mph WSW | 0% |
| Saturday | 78°F | Sunny | 3 to 14 mph WSW | 0% |
| Saturday Night | 57°F | Partly Cloudy | 7 to 13 mph WSW | 1% |
| Sunday | 71°F | Mostly Cloudy | 7 to 12 mph W | 3% |
| Sunday Night | 57°F | Mostly Cloudy | 5 to 12 mph W | 3% |
| Monday | 74°F | Mostly Sunny | 5 to 12 mph WSW | 2% |
| Monday Night | 57°F | Partly Cloudy | 5 to 12 mph WSW | 2% |
| Tuesday | 76°F | Mostly Sunny | 3 to 10 mph WSW | 1% |
| Tuesday Night | 57°F | Mostly Clear | 2 to 10 mph WSW | 0% |
| Wednesday | 85°F | Sunny | 1 to 10 mph WSW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 1 to 10 mph W | 0% |
| Thursday | 86°F | Sunny | 1 to 12 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 to 12 mph W | 0% |
| Friday | 80°F | Mostly Sunny | 3 to 13 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Mateo, CA
Last spring frost
Dec 29
First fall frost
Dec 26
Growing season
365 days
Hardiness zone
10a
Explore more for San Mateo, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.