In March, Castro Valley typically sees daytime highs of 16.9°C and overnight lows around 7.0°C. Compared to the annual average high of 20.0°C, March runs -3.1°C.
March in Castro Valley averages a daytime high of 16.9°C and an overnight low of 7.0°C.
March runs -3.1°C compared to Castro Valley's annual average high of 20.0°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 16.9°C and cooler evenings around 7.0°C.