In May, Idaho Falls typically sees daytime highs of 19.9°C and overnight lows around 3.8°C. Compared to the annual average high of 14.5°C, May runs +5.5°C.
May in Idaho Falls averages a daytime high of 19.9°C and an overnight low of 3.8°C.
May runs +5.5°C compared to Idaho Falls's annual average high of 14.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 19.9°C and cooler evenings around 3.8°C.