In April, San Mateo typically sees daytime highs of 32.9°C and overnight lows around 24.0°C. Compared to the annual average high of 30.4°C, April runs +2.5°C.
April in San Mateo averages a daytime high of 32.9°C and an overnight low of 24.0°C.
April runs +2.5°C compared to San Mateo's annual average high of 30.4°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 32.9°C and cooler evenings around 24.0°C.