In May, Heilbron typically sees daytime highs of 20.7°C and overnight lows around 3.4°C. Compared to the annual average high of 24.1°C, May runs -3.4°C.
May in Heilbron averages a daytime high of 20.7°C and an overnight low of 3.4°C.
May runs -3.4°C compared to Heilbron's annual average high of 24.1°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 20.7°C and cooler evenings around 3.4°C.