In July, Diamond Bar typically sees daytime highs of 32.1°C and overnight lows around 16.4°C. Compared to the annual average high of 24.1°C, July runs +7.9°C.
July in Diamond Bar averages a daytime high of 32.1°C and an overnight low of 16.4°C.
July runs +7.9°C compared to Diamond Bar's annual average high of 24.1°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 32.1°C and cooler evenings around 16.4°C.