In August, Simi Valley typically sees daytime highs of 29.2°C and overnight lows around 15.8°C. Compared to the annual average high of 22.3°C, August runs +6.9°C.
August in Simi Valley averages a daytime high of 29.2°C and an overnight low of 15.8°C.
August runs +6.9°C compared to Simi Valley's annual average high of 22.3°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 29.2°C and cooler evenings around 15.8°C.