In May, Union typically sees daytime highs of 22.1°C and overnight lows around 9.3°C. Compared to the annual average high of 16.8°C, May runs +5.3°C.
May in Union averages a daytime high of 22.1°C and an overnight low of 9.3°C.
May runs +5.3°C compared to Union's annual average high of 16.8°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.1°C and cooler evenings around 9.3°C.