In May, Heidelberg typically sees daytime highs of 20.2°C and overnight lows around 3.8°C. Compared to the annual average high of 23.2°C, May runs -3.0°C.
May in Heidelberg averages a daytime high of 20.2°C and an overnight low of 3.8°C.
May runs -3.0°C compared to Heidelberg's annual average high of 23.2°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 20.2°C and cooler evenings around 3.8°C.