In June, Diamond Bar typically sees daytime highs of 27.9°C and overnight lows around 13.3°C. Compared to the annual average high of 24.1°C, June runs +3.7°C.
June in Diamond Bar averages a daytime high of 27.9°C and an overnight low of 13.3°C.
June runs +3.7°C compared to Diamond Bar's annual average high of 24.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 27.9°C and cooler evenings around 13.3°C.