In May, Basel typically sees daytime highs of 18.5°C and overnight lows around 7.8°C. Compared to the annual average high of 13.9°C, May runs +4.6°C.
May in Basel averages a daytime high of 18.5°C and an overnight low of 7.8°C.
May runs +4.6°C compared to Basel's annual average high of 13.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.5°C and cooler evenings around 7.8°C.