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.

Overnight

57°F

Partly Cloudy

Partly cloudy, with a low around 57. Southwest wind 2 to 7 mph.

7-day forecast for San Carlos

When	Temp	Forecast	Wind	Precip
Overnight	57°F	Partly Cloudy	2 to 7 mph SW	0%
Saturday	79°F	Mostly Sunny	2 to 12 mph WSW	0%
Saturday Night	56°F	Partly Cloudy	3 to 12 mph WSW	1%
Sunday	72°F	Mostly Cloudy	3 to 9 mph WSW	3%
Sunday Night	57°F	Mostly Cloudy	2 to 9 mph W	3%
Monday	75°F	Mostly Sunny	2 to 9 mph WSW	2%
Monday Night	56°F	Partly Cloudy	2 to 9 mph WSW	2%
Tuesday	77°F	Mostly Sunny	2 to 9 mph WSW	0%
Tuesday Night	56°F	Mostly Clear	0 to 9 mph WSW	0%
Wednesday	86°F	Sunny	0 to 8 mph WSW	0%
Wednesday Night	60°F	Mostly Clear	0 to 8 mph W	0%
Thursday	87°F	Sunny	0 to 9 mph W	0%
Thursday Night	59°F	Mostly Clear	2 to 9 mph WSW	0%
Friday	81°F	Mostly Sunny	2 to 10 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

Nearby towns & communities

Atherton Baywood Park Belmont Brisbane Broadmoor Burlingame Colma Daly City El Granada Emerald Lake Hills Foster City Half Moon Bay Highlands Hillsborough La Honda Ladera Loma Mar Millbrae Montara Moss Beach North Fair Oaks Pacifica Pescadero Portola Valley Redwood City San Bruno San Mateo South San Francisco West Menlo Park Woodside

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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 Sep 19, 2026.