El Cajon Weather in September

September in El Cajon averages 31°C (88°F) during the day and 17°C (63°F) at night. With only 4.1 mm (0.2 in) of rainfall expected on average, it's a largely dry month.

Rainfall in El Cajon in September

Expect around a single day of rain based on historical data, with 4.1 mm (0.2 in) average. Any rain that does arrive is likely to be fairly light and short-lived.

Temperature in El Cajon in September

September tends to be one of the excellent months in El Cajon, with 31°C (88°F) in the afternoon and 17°C (63°F) overnight. Sunshine and humidity can make it feel even warmer than the raw temperature suggests. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in El Cajon in September

There are approximately 253 hours of sunshine this month, resulting in mostly clear days.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit El Cajon. Our weather planner can help you explore destinations with more pleasant weather conditions.