In May, San Mateo typically sees daytime highs of 30.4°C and overnight lows around 19.7°C. Compared to the annual average high of 29.6°C, May runs +0.8°C.
May in San Mateo averages a daytime high of 30.4°C and an overnight low of 19.7°C.
May runs +0.8°C compared to San Mateo's annual average high of 29.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 30.4°C and cooler evenings around 19.7°C.