In May, Rennes typically sees daytime highs of 18.2°C and overnight lows around 7.7°C. Compared to the annual average high of 15.3°C, May runs +2.8°C.
May in Rennes averages a daytime high of 18.2°C and an overnight low of 7.7°C.
May runs +2.8°C compared to Rennes's annual average high of 15.3°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.2°C and cooler evenings around 7.7°C.