In May, Chicago typically sees daytime highs of 20.1°C and overnight lows around 9.7°C. Compared to the annual average high of 14.1°C, May runs +6.0°C.
May in Chicago averages a daytime high of 20.1°C and an overnight low of 9.7°C.
May runs +6.0°C compared to Chicago's annual average high of 14.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 20.1°C and cooler evenings around 9.7°C.