In May, Rialto typically sees daytime highs of 25.4°C and overnight lows around 10.1°C. Compared to the annual average high of 24.7°C, May runs +0.7°C.
May in Rialto averages a daytime high of 25.4°C and an overnight low of 10.1°C.
May runs +0.7°C compared to Rialto's annual average high of 24.7°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 25.4°C and cooler evenings around 10.1°C.