In May, Diamond Bar typically sees daytime highs of 24.2°C and overnight lows around 10.7°C. Compared to the annual average high of 24.1°C, May runs +0.1°C.
May in Diamond Bar averages a daytime high of 24.2°C and an overnight low of 10.7°C.
May runs +0.1°C compared to Diamond Bar's annual average high of 24.1°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 24.2°C and cooler evenings around 10.7°C.