In May, Flagstaff typically sees daytime highs of 20.4°C and overnight lows around 2.1°C. Compared to the annual average high of 16.9°C, May runs +3.5°C.
May in Flagstaff averages a daytime high of 20.4°C and an overnight low of 2.1°C.
May runs +3.5°C compared to Flagstaff's annual average high of 16.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 20.4°C and cooler evenings around 2.1°C.