Sunnyvale, CA Weather & Growing Conditions

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

Tonight

56°F

Mostly Clear then Patchy Fog

Patchy fog after 4am. Mostly clear, with a low around 56. North wind 1 to 9 mph.

7-day forecast for Sunnyvale

When	Temp	Forecast	Wind	Precip
Tonight	56°F	Mostly Clear then Patchy Fog	1 to 9 mph N	0%
Saturday	80°F	Patchy Fog then Mostly Sunny	1 to 10 mph E	0%
Saturday Night	57°F	Mostly Cloudy	2 to 9 mph NW	0%
Sunday	75°F	Mostly Cloudy	2 to 8 mph WNW	3%
Sunday Night	57°F	Mostly Cloudy then Patchy Fog	1 to 8 mph W	3%
Monday	77°F	Patchy Fog then Mostly Sunny	1 to 9 mph W	0%
Monday Night	57°F	Partly Cloudy	2 to 9 mph WSW	0%
Tuesday	80°F	Sunny	2 to 9 mph WSW	0%
Tuesday Night	58°F	Mostly Clear	0 to 9 mph WSW	0%
Wednesday	87°F	Sunny	0 to 8 mph WSW	0%
Wednesday Night	61°F	Mostly Clear	0 to 8 mph SW	0%
Thursday	89°F	Sunny	0 to 9 mph W	0%
Thursday Night	61°F	Mostly Clear	1 to 9 mph W	0%
Friday	83°F	Mostly Sunny	1 to 10 mph W	0%

Forecast source: National Weather Service (api.weather.gov) for Sunnyvale (37.386, -122.026). Updated through the day.

Growing snapshot for Sunnyvale

Last spring frost

Jan 6

First fall frost

Dec 23

Growing season

353 days

Hardiness zone

10a

More local growing data for Sunnyvale: nearby ZIP 94085 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Moffett Federal Airfield, Ca (2 mi from Sunnyvale). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.