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.

Today

74°F

Mostly Sunny

Mostly sunny, with a high near 74. West wind 5 to 10 mph.

7-day forecast for Granite Hills

When	Temp	Forecast	Wind	Precip
Today	74°F	Mostly Sunny	5 to 10 mph W	1%
Tonight	55°F	Slight Chance Rain Showers	5 mph NW	16%
Wednesday	74°F	Mostly Sunny	0 to 5 mph W	0%
Wednesday Night	54°F	Mostly Clear	0 to 5 mph NE	0%
Thursday	78°F	Sunny	0 to 5 mph SW	0%
Thursday Night	54°F	Mostly Clear	0 to 5 mph NE	0%
Friday	83°F	Sunny	0 to 5 mph NE	0%
Friday Night	57°F	Clear	5 to 10 mph NE	0%
Saturday	86°F	Sunny	5 mph NE	0%
Saturday Night	59°F	Mostly Clear	5 to 10 mph NE	0%
Sunday	87°F	Sunny	5 to 10 mph N	0%
Sunday Night	61°F	Partly Cloudy	5 to 15 mph NE	0%
Monday	84°F	Mostly Sunny	0 to 5 mph W	0%
Monday Night	59°F	Partly Cloudy	0 to 5 mph N	0%

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 Nov 3, 2026.