San Carlos, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Carlos, a city in San Mateo County, California.
Today
86°F
Sunny
Sunny. High near 86, with temperatures falling to around 83 in the afternoon. West wind 2 to 9 mph.
7-day forecast for San Carlos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 2 to 9 mph W | 0% |
| Tonight | 57°F | Mostly Clear | 2 to 8 mph SW | 0% |
| Wednesday | 84°F | Sunny | 2 to 9 mph WSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 1 to 9 mph WSW | 0% |
| Thursday | 83°F | Sunny | 0 to 9 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 1 to 9 mph WNW | 0% |
| Friday | 87°F | Sunny | 1 to 9 mph WNW | 0% |
| Friday Night | 60°F | Mostly Clear | 1 to 9 mph W | 0% |
| Saturday | 86°F | Sunny | 1 to 9 mph W | 0% |
| Saturday Night | 61°F | Mostly Clear | 2 to 9 mph WSW | 0% |
| Sunday | 82°F | Sunny | 2 to 12 mph W | 0% |
| Sunday Night | 58°F | Mostly Clear | 5 to 12 mph WSW | 0% |
| Monday | 78°F | Sunny | 5 to 12 mph WSW | 0% |
| Monday Night | 57°F | Mostly Clear | 5 to 12 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for San Carlos (37.499, -122.268). Updated through the day.
Growing snapshot for San Carlos
Last spring frost
Jan 17
First fall frost
Dec 12
Growing season
333 days
Hardiness zone
10a
More local growing data for San Carlos: nearby ZIP 94070 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Redwood City, Ca (2.3 mi from San Carlos). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.