El Cajon Weather in September
What's the weather like in El Cajon (California) in September 2025?
The climate in El Cajon during September can be summarized as warm, humid and very dry.
September is in the fall / autumn in El Cajon and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 16°C (60°F) is normal.
| Daytime temperature | 28°C 82.4°F |
|---|---|
| Nightly temperature | 15.6°C 60.1°F |
| Average temperature | 21.8°C 71.2°F |
| Daily sunshine | 9.4 hrs |
| Avg rainfall | 6 mm 0.2 ins |
| Rainy days | 1 days |
| Sea temperature | 20.9°C 69.7°F |
| Humidity | 71% |
| Windspeed | 13.7kph 9 mph |
On average September is the 4th driest month of the year in El Cajon with around 6mm 0.2 inches of rain making it a very dry time to visit.
On the flip side this corresponds to an average of 9.4 hours of sunshine per day.
September temperatures in El Cajon
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in El Cajon in September 2025.
Other monthly averages
Best places to visit in September
El Cajon weather stats
| Hottest month: | August | 28.9°C 84°F |
|---|---|---|
| Driest month: | June | 2mm 0.1ins |
| Sunniest month: | January | 8.5hrs |
| Coldest month: | January | 17.7°C 63.9°F |
| Wettest month: | January | 60mm 2.4ins |
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