In December, El Cajon typically sees daytime highs of 19.2°C and overnight lows around 4.0°C. Compared to the annual average high of 23.9°C, December runs -4.7°C.
December in El Cajon averages a daytime high of 19.2°C and an overnight low of 4.0°C.
December runs -4.7°C compared to El Cajon's annual average high of 23.9°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 19.2°C and cooler evenings around 4.0°C.