In May, Gresham typically sees daytime highs of 18.8°C and overnight lows around 6.8°C. Compared to the annual average high of 16.1°C, May runs +2.7°C.
May in Gresham averages a daytime high of 18.8°C and an overnight low of 6.8°C.
May runs +2.7°C compared to Gresham's annual average high of 16.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.8°C and cooler evenings around 6.8°C.