El Cajon, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for El Cajon, a city in San Diego County, California.

Tonight

56°F

Slight Chance Rain Showers

A slight chance of rain showers between 10pm and 4am, then patchy fog. Mostly cloudy, with a low around 56. North wind 0 to 5 mph. Chance of precipitation is 20%.

7-day forecast for El Cajon

When	Temp	Forecast	Wind	Precip
Tonight	56°F	Slight Chance Rain Showers	0 to 5 mph N	18%
Wednesday	76°F	Patchy Fog then Mostly Sunny	0 to 5 mph NW	0%
Wednesday Night	55°F	Mostly Clear	0 to 5 mph NE	0%
Thursday	80°F	Sunny	0 to 5 mph W	0%
Thursday Night	56°F	Mostly Clear	0 to 5 mph NE	0%
Friday	84°F	Sunny	0 to 5 mph N	0%
Friday Night	57°F	Clear	5 to 10 mph NE	0%
Saturday	88°F	Sunny	0 to 5 mph NE	0%
Saturday Night	59°F	Mostly Clear	5 to 10 mph NE	0%
Sunday	89°F	Sunny	0 to 5 mph NW	0%
Sunday Night	61°F	Partly Cloudy	5 to 10 mph NE	0%
Monday	86°F	Mostly Sunny	0 to 5 mph W	0%
Monday Night	60°F	Partly Cloudy	0 to 5 mph N	0%
Tuesday	84°F	Mostly Sunny	0 to 5 mph NW	2%

Forecast source: National Weather Service (api.weather.gov) for El Cajon (32.802, -116.960). Updated through the day.

Growing snapshot for El Cajon

Last spring frost

Jan 6

First fall frost

Dec 21

Growing season

350 days

Hardiness zone

10a

More local growing data for El Cajon: nearby ZIP 92020 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, El Cajon, Ca (2.4 mi from El Cajon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.