In December, Santa Monica typically sees daytime highs of 18.9°C and overnight lows around 6.7°C. Compared to the annual average high of 23.7°C, December runs -4.7°C.
December in Santa Monica averages a daytime high of 18.9°C and an overnight low of 6.7°C.
December runs -4.7°C compared to Santa Monica's annual average high of 23.7°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 6.7°C.