San Mateo, CA Weather & Growing Conditions
Tonight
51°F
Chance Light Rain then Mostly Cloudy
A chance of rain before 10pm. Mostly cloudy, with a low around 51. East southeast wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Chance Light Rain then Mostly Cloudy | 7 mph ESE | 40% |
| Wednesday | 67°F | Sunny | 5 to 15 mph N | 2% |
| Wednesday Night | 52°F | Mostly Cloudy | 2 to 15 mph NW | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 2 to 7 mph NNW | 0% |
| Thursday Night | 52°F | Mostly Clear | 2 to 9 mph NNW | 0% |
| Friday | 74°F | Sunny | 2 to 6 mph N | 0% |
| Friday Night | 52°F | Clear | 1 to 6 mph NNW | 0% |
| Saturday | 78°F | Sunny | 1 to 5 mph NNE | 0% |
| Saturday Night | 54°F | Mostly Clear | 2 to 7 mph NW | 0% |
| Sunday | 75°F | Mostly Sunny | 2 to 7 mph NNW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 2 to 7 mph WNW | 0% |
| Monday | 72°F | Partly Sunny | 2 to 9 mph NW | 1% |
| Monday Night | 54°F | Partly Cloudy | 2 to 9 mph NW | 2% |
| Tuesday | 73°F | Mostly Sunny | 1 to 7 mph N | 7% |
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 Nov 4, 2026.