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.

Today

81°F

Sunny

Sunny. High near 81, with temperatures falling to around 79 in the afternoon. West northwest wind 2 to 10 mph.

7-day forecast for San Mateo

When	Temp	Forecast	Wind	Precip
Today	81°F	Sunny	2 to 10 mph WNW	0%
Tonight	58°F	Mostly Clear	2 to 9 mph WSW	1%
Wednesday	81°F	Sunny	2 to 10 mph W	0%
Wednesday Night	59°F	Mostly Clear	1 to 10 mph W	0%
Thursday	80°F	Mostly Sunny	1 to 10 mph W	0%
Thursday Night	60°F	Mostly Clear	2 to 10 mph WNW	0%
Friday	83°F	Sunny	2 to 10 mph WNW	0%
Friday Night	61°F	Mostly Clear	1 to 10 mph W	0%
Saturday	85°F	Sunny	1 to 10 mph W	0%
Saturday Night	62°F	Mostly Clear	5 to 10 mph W	0%
Sunday	81°F	Sunny	5 to 12 mph WSW	0%
Sunday Night	59°F	Mostly Clear	6 to 12 mph WSW	0%
Monday	78°F	Mostly Sunny	6 to 13 mph WSW	0%
Monday Night	58°F	Mostly Clear	6 to 13 mph WSW	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 Aug 4, 2026.