In May, Richland typically sees daytime highs of 24.2°C and overnight lows around 8.6°C. Compared to the annual average high of 18.7°C, May runs +5.6°C.
May in Richland averages a daytime high of 24.2°C and an overnight low of 8.6°C.
May runs +5.6°C compared to Richland's annual average high of 18.7°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 24.2°C and cooler evenings around 8.6°C.