In August, San Mateo typically sees daytime highs of 21.1°C and overnight lows around 12.1°C. Compared to the annual average high of 17.7°C, August runs +3.4°C.
August in San Mateo averages a daytime high of 21.1°C and an overnight low of 12.1°C.
August runs +3.4°C compared to San Mateo's annual average high of 17.7°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 21.1°C and cooler evenings around 12.1°C.