In January, La Mesa typically sees daytime highs of 18.2°C and overnight lows around 6.3°C. Compared to the annual average high of 22.5°C, January runs -4.3°C.
January in La Mesa averages a daytime high of 18.2°C and an overnight low of 6.3°C.
January runs -4.3°C compared to La Mesa's annual average high of 22.5°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 18.2°C and cooler evenings around 6.3°C.