In August, San Bernardino typically sees daytime highs of 33.9°C and overnight lows around 16.6°C. Compared to the annual average high of 24.7°C, August runs +9.2°C.
August in San Bernardino averages a daytime high of 33.9°C and an overnight low of 16.6°C.
August runs +9.2°C compared to San Bernardino's annual average high of 24.7°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 33.9°C and cooler evenings around 16.6°C.