In April, Diamond Bar typically sees daytime highs of 21.7°C and overnight lows around 8.1°C. Compared to the annual average high of 24.1°C, April runs -2.4°C.
April in Diamond Bar averages a daytime high of 21.7°C and an overnight low of 8.1°C.
April runs -2.4°C compared to Diamond Bar's annual average high of 24.1°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 21.7°C and cooler evenings around 8.1°C.