San Mateo, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Mateo, a city in San Mateo County, California.
This Afternoon
75°F
Sunny
Sunny. High near 75, with temperatures falling to around 72 in the afternoon. West northwest wind around 14 mph, with gusts as high as 20 mph.
7-day forecast for San Mateo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Sunny | 14 mph WNW | 0% |
| Tonight | 58°F | Mostly Clear | 3 to 13 mph WSW | 1% |
| Saturday | 77°F | Sunny | 2 to 12 mph WNW | 0% |
| Saturday Night | 58°F | Mostly Cloudy | 5 to 10 mph W | 1% |
| Sunday | 71°F | Mostly Cloudy | 5 to 10 mph W | 4% |
| Sunday Night | 58°F | Mostly Cloudy | 3 to 10 mph W | 4% |
| Monday | 74°F | Mostly Sunny | 3 to 10 mph WSW | 0% |
| Monday Night | 58°F | Partly Cloudy | 3 to 10 mph WSW | 0% |
| Tuesday | 79°F | Sunny | 3 to 9 mph WSW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 1 to 9 mph WSW | 0% |
| Wednesday | 87°F | Sunny | 1 to 10 mph W | 0% |
| Wednesday Night | 60°F | Mostly Clear | 1 to 10 mph WNW | 0% |
| Thursday | 87°F | Sunny | 1 to 10 mph WNW | 0% |
| Thursday Night | 61°F | Partly Cloudy | 2 to 10 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for San Mateo (37.560, -122.311). Updated through the day.
Growing snapshot for San Mateo
Last spring frost
Dec 29
First fall frost
Dec 26
Growing season
365 days
Hardiness zone
10a
More local growing data for San Mateo: nearby ZIP 94401 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (3.9 mi from San Mateo). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.