In August, Walnut Creek typically sees daytime highs of 26.3°C and overnight lows around 12.5°C. Compared to the annual average high of 20.0°C, August runs +6.3°C.
August in Walnut Creek averages a daytime high of 26.3°C and an overnight low of 12.5°C.
August runs +6.3°C compared to Walnut Creek's annual average high of 20.0°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.3°C and cooler evenings around 12.5°C.