In August, San Mateo typically sees daytime highs of 29.6°C and overnight lows around 23.7°C. Compared to the annual average high of 30.4°C, August runs -0.8°C.
August in San Mateo averages a daytime high of 29.6°C and an overnight low of 23.7°C.
August runs -0.8°C compared to San Mateo's annual average high of 30.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 29.6°C and cooler evenings around 23.7°C.