In May, Cardiff typically sees daytime highs of 15.3°C and overnight lows around 7.5°C. Compared to the annual average high of 13.4°C, May runs +2.0°C.
May in Cardiff averages a daytime high of 15.3°C and an overnight low of 7.5°C.
May runs +2.0°C compared to Cardiff's annual average high of 13.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 15.3°C and cooler evenings around 7.5°C.