In April, San Mateo typically sees daytime highs of 30.9°C and overnight lows around 19.0°C. Compared to the annual average high of 29.6°C, April runs +1.4°C.
April in San Mateo averages a daytime high of 30.9°C and an overnight low of 19.0°C.
April runs +1.4°C compared to San Mateo's annual average high of 29.6°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 30.9°C and cooler evenings around 19.0°C.