In May, Keflavik typically sees daytime highs of 8.3°C and overnight lows around 3.8°C. Compared to the annual average high of 6.8°C, May runs +1.5°C.
May in Keflavik averages a daytime high of 8.3°C and an overnight low of 3.8°C.
May runs +1.5°C compared to Keflavik's annual average high of 6.8°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 8.3°C and cooler evenings around 3.8°C.