In May, Heidelberg typically sees daytime highs of 19.2°C and overnight lows around 8.2°C. Compared to the annual average high of 14.2°C, May runs +5.0°C.
May in Heidelberg averages a daytime high of 19.2°C and an overnight low of 8.2°C.
May runs +5.0°C compared to Heidelberg's annual average high of 14.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 19.2°C and cooler evenings around 8.2°C.