In December, San Clemente typically sees daytime highs of 19.6°C and overnight lows around 8.7°C. Compared to the annual average high of 22.2°C, December runs -2.6°C.
December in San Clemente averages a daytime high of 19.6°C and an overnight low of 8.7°C.
December runs -2.6°C compared to San Clemente's annual average high of 22.2°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 19.6°C and cooler evenings around 8.7°C.