In December, La Mesa typically sees daytime highs of 19.1°C and overnight lows around 6.5°C. Compared to the annual average high of 22.5°C, December runs -3.4°C.
December in La Mesa averages a daytime high of 19.1°C and an overnight low of 6.5°C.
December runs -3.4°C compared to La Mesa's annual average high of 22.5°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 19.1°C and cooler evenings around 6.5°C.