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.
This Afternoon
65°F
Light Rain Likely
Rain likely. Partly sunny. High near 65, with temperatures falling to around 60 in the afternoon. South southwest wind 5 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for San Carlos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Light Rain Likely | 5 to 14 mph SSW | 59% |
| Tonight | 50°F | Chance Light Rain then Mostly Cloudy | 2 to 6 mph ESE | 40% |
| Wednesday | 66°F | Sunny | 3 to 14 mph N | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 1 to 14 mph NW | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 1 to 7 mph NNW | 0% |
| Thursday Night | 51°F | Mostly Clear | 1 to 7 mph NNW | 0% |
| Friday | 73°F | Sunny | 1 to 6 mph NNE | 0% |
| Friday Night | 52°F | Clear | 0 to 6 mph N | 0% |
| Saturday | 77°F | Sunny | 3 mph NNE | 0% |
| Saturday Night | 54°F | Mostly Clear | 1 to 7 mph NW | 0% |
| Sunday | 75°F | Mostly Sunny | 1 to 7 mph NNW | 0% |
| Sunday Night | 54°F | Partly Cloudy | 1 to 7 mph WNW | 0% |
| Monday | 72°F | Partly Sunny | 1 to 8 mph NW | 1% |
| Monday Night | 53°F | Partly Cloudy | 1 to 8 mph NNW | 2% |
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 Nov 4, 2026.