In May, Longmont typically sees daytime highs of 22.0°C and overnight lows around 5.5°C. Compared to the annual average high of 18.2°C, May runs +3.8°C.
May in Longmont averages a daytime high of 22.0°C and an overnight low of 5.5°C.
May runs +3.8°C compared to Longmont's annual average high of 18.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.0°C and cooler evenings around 5.5°C.