In December, San Francisco typically sees daytime highs of 13.7°C and overnight lows around 5.0°C. Compared to the annual average high of 19.2°C, December runs -5.5°C.
December in San Francisco averages a daytime high of 13.7°C and an overnight low of 5.0°C.
December runs -5.5°C compared to San Francisco's annual average high of 19.2°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 13.7°C and cooler evenings around 5.0°C.