In August, Vallejo typically sees daytime highs of 26.8°C and overnight lows around 11.7°C. Compared to the annual average high of 20.8°C, August runs +6.0°C.
August in Vallejo averages a daytime high of 26.8°C and an overnight low of 11.7°C.
August runs +6.0°C compared to Vallejo's annual average high of 20.8°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 26.8°C and cooler evenings around 11.7°C.