In March, Simi Valley typically sees daytime highs of 18.0°C and overnight lows around 6.0°C. Compared to the annual average high of 22.3°C, March runs -4.3°C.
March in Simi Valley averages a daytime high of 18.0°C and an overnight low of 6.0°C.
March runs -4.3°C compared to Simi Valley's annual average high of 22.3°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 18.0°C and cooler evenings around 6.0°C.