In May, Guidonia Montecelio typically sees daytime highs of 23.4°C and overnight lows around 11.0°C. Compared to the annual average high of 20.9°C, May runs +2.5°C.
May in Guidonia Montecelio averages a daytime high of 23.4°C and an overnight low of 11.0°C.
May runs +2.5°C compared to Guidonia Montecelio's annual average high of 20.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 23.4°C and cooler evenings around 11.0°C.