In May, Waukegan typically sees daytime highs of 19.0°C and overnight lows around 8.3°C. Compared to the annual average high of 13.5°C, May runs +5.5°C.
May in Waukegan averages a daytime high of 19.0°C and an overnight low of 8.3°C.
May runs +5.5°C compared to Waukegan's annual average high of 13.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 19.0°C and cooler evenings around 8.3°C.