In December, San Jose typically sees daytime highs of 30.4°C and overnight lows around 23.2°C. Compared to the annual average high of 31.0°C, December runs -0.6°C.
December in San Jose averages a daytime high of 30.4°C and an overnight low of 23.2°C.
December runs -0.6°C compared to San Jose's annual average high of 31.0°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 30.4°C and cooler evenings around 23.2°C.