In May, London typically sees daytime highs of 18.7°C and overnight lows around 6.7°C. Compared to the annual average high of 12.6°C, May runs +6.1°C.
May in London averages a daytime high of 18.7°C and an overnight low of 6.7°C.
May runs +6.1°C compared to London's annual average high of 12.6°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.7°C and cooler evenings around 6.7°C.