In December, San Jose typically sees daytime highs of 13.5°C and overnight lows around 3.6°C. Compared to the annual average high of 21.3°C, December runs -7.8°C.
December in San Jose averages a daytime high of 13.5°C and an overnight low of 3.6°C.
December runs -7.8°C compared to San Jose's annual average high of 21.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 13.5°C and cooler evenings around 3.6°C.