In May, Heilbronn typically sees daytime highs of 18.9°C and overnight lows around 7.8°C. Compared to the annual average high of 14.0°C, May runs +4.9°C.
May in Heilbronn averages a daytime high of 18.9°C and an overnight low of 7.8°C.
May runs +4.9°C compared to Heilbronn's annual average high of 14.0°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 7.8°C.