In March, Diamond Bar typically sees daytime highs of 19.4°C and overnight lows around 6.6°C. Compared to the annual average high of 24.1°C, March runs -4.8°C.
March in Diamond Bar averages a daytime high of 19.4°C and an overnight low of 6.6°C.
March runs -4.8°C compared to Diamond Bar's annual average high of 24.1°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 19.4°C and cooler evenings around 6.6°C.