In August, Fullerton typically sees daytime highs of 30.0°C and overnight lows around 17.0°C. Compared to the annual average high of 23.9°C, August runs +6.1°C.
August in Fullerton averages a daytime high of 30.0°C and an overnight low of 17.0°C.
August runs +6.1°C compared to Fullerton's annual average high of 23.9°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 30.0°C and cooler evenings around 17.0°C.