In May, Walnut Creek typically sees daytime highs of 22.0°C and overnight lows around 9.3°C. Compared to the annual average high of 20.0°C, May runs +2.0°C.
May in Walnut Creek averages a daytime high of 22.0°C and an overnight low of 9.3°C.
May runs +2.0°C compared to Walnut Creek's annual average high of 20.0°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 22.0°C and cooler evenings around 9.3°C.