In June, Castro Valley typically sees daytime highs of 23.9°C and overnight lows around 11.8°C. Compared to the annual average high of 20.0°C, June runs +3.9°C.
June in Castro Valley averages a daytime high of 23.9°C and an overnight low of 11.8°C.
June runs +3.9°C compared to Castro Valley's annual average high of 20.0°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.9°C and cooler evenings around 11.8°C.