In April, San Mateo typically sees daytime highs of 16.7°C and overnight lows around 7.7°C. Compared to the annual average high of 17.7°C, April runs -0.9°C.
April in San Mateo averages a daytime high of 16.7°C and an overnight low of 7.7°C.
April runs -0.9°C compared to San Mateo's annual average high of 17.7°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 16.7°C and cooler evenings around 7.7°C.