San Jose, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for San Jose, a city in Santa Clara County, California.

Tonight

55°F

Mostly Clear then Areas Of Fog

Areas of fog after 4am. Mostly clear, with a low around 55. West southwest wind 1 to 8 mph.

7-day forecast for San Jose

When	Temp	Forecast	Wind	Precip
Tonight	55°F	Mostly Clear then Areas Of Fog	1 to 8 mph WSW	0%
Saturday	86°F	Areas Of Fog then Mostly Sunny	1 to 8 mph SW	0%
Saturday Night	57°F	Mostly Cloudy	1 to 7 mph NW	0%
Sunday	80°F	Partly Sunny	1 to 7 mph WNW	1%
Sunday Night	56°F	Mostly Cloudy then Patchy Fog	1 to 7 mph W	1%
Monday	83°F	Patchy Fog then Sunny	1 to 7 mph WSW	0%
Monday Night	57°F	Mostly Clear	0 to 7 mph SW	0%
Tuesday	86°F	Sunny	1 to 8 mph W	0%
Tuesday Night	59°F	Mostly Clear	0 to 8 mph WNW	0%
Wednesday	94°F	Sunny	0 to 8 mph NNW	0%
Wednesday Night	64°F	Mostly Clear	0 to 8 mph NNW	0%
Thursday	95°F	Sunny	0 to 9 mph NW	0%
Thursday Night	62°F	Mostly Clear	0 to 9 mph WNW	0%
Friday	89°F	Sunny	0 to 10 mph WNW	0%

Forecast source: National Weather Service (api.weather.gov) for San Jose (37.296, -121.815). Updated through the day.

Growing snapshot for San Jose

Last spring frost

Jan 2

First fall frost

Dec 25

Growing season

362 days

Hardiness zone

More local growing data for San Jose: nearby ZIP 95121 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, San Jose, Ca (6 mi from San Jose). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.