In September, El Cajon typically sees daytime highs of 29.6°C and overnight lows around 14.1°C. Compared to the annual average high of 23.9°C, September runs +5.8°C.
September in El Cajon averages a daytime high of 29.6°C and an overnight low of 14.1°C.
September runs +5.8°C compared to El Cajon's annual average high of 23.9°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 29.6°C and cooler evenings around 14.1°C.