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
63°F
Mostly Cloudy
Mostly cloudy, with a low around 63. South wind 0 to 5 mph.
7-day forecast for El Cajon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Mostly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 80°F | Partly Sunny | 0 to 10 mph SW | 2% |
| Sunday Night | 64°F | Mostly Cloudy | 0 to 5 mph S | 3% |
| Monday | 78°F | Mostly Sunny | 0 to 10 mph S | 2% |
| Monday Night | 62°F | Partly Cloudy | 0 to 5 mph S | 1% |
| Tuesday | 79°F | Sunny | 0 to 10 mph NW | 0% |
| Tuesday Night | 63°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Wednesday | 84°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 65°F | Mostly Clear | 0 to 5 mph N | 0% |
| Thursday | 87°F | Sunny | 0 to 10 mph NW | 3% |
| Thursday Night | 67°F | Mostly Clear | 0 to 5 mph NW | 1% |
| Friday | 88°F | Sunny | 0 to 5 mph NW | 1% |
| Friday Night | 67°F | Mostly Clear | 0 to 5 mph N | 1% |
| Saturday | 90°F | Sunny | 0 to 5 mph NW | 1% |
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 Sep 20, 2026.