Granite Hills, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Granite Hills, a community in San Diego County, California.

Tonight

58°F

Partly Cloudy

Partly cloudy, with a low around 58. North wind 0 to 5 mph.

7-day forecast for Granite Hills

When	Temp	Forecast	Wind	Precip
Tonight	58°F	Partly Cloudy	0 to 5 mph N	1%
Saturday	82°F	Sunny	0 to 10 mph NW	0%
Saturday Night	59°F	Partly Cloudy	0 to 5 mph NE	0%
Sunday	80°F	Mostly Sunny	0 to 10 mph SW	0%
Sunday Night	60°F	Mostly Cloudy	0 to 5 mph SW	2%
Monday	78°F	Mostly Sunny	0 to 10 mph SW	2%
Monday Night	58°F	Mostly Clear	0 to 10 mph NW	0%
Tuesday	80°F	Sunny	0 to 10 mph NW	0%
Tuesday Night	59°F	Mostly Clear	0 to 10 mph NW	0%
Wednesday	86°F	Sunny	0 to 10 mph NW	3%
Wednesday Night	63°F	Mostly Clear	0 to 5 mph N	2%
Thursday	88°F	Sunny	0 to 10 mph NW	3%
Thursday Night	65°F	Mostly Clear	0 to 5 mph NW	1%
Friday	89°F	Sunny	0 to 5 mph NW	9%

Forecast source: National Weather Service (api.weather.gov) for Granite Hills (32.803, -116.906). Updated through the day.

Growing snapshot for Granite Hills

Last spring frost

Jan 6

First fall frost

Dec 21

Growing season

350 days

Hardiness zone

10b

More local growing data for Granite Hills: nearby ZIP 92019 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, El Cajon, Ca (3.6 mi from Granite Hills). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.