In May, Helsinki typically sees daytime highs of 11.9°C and overnight lows around 4.7°C. Compared to the annual average high of 7.7°C, May runs +4.2°C.
May in Helsinki averages a daytime high of 11.9°C and an overnight low of 4.7°C.
May runs +4.2°C compared to Helsinki's annual average high of 7.7°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 11.9°C and cooler evenings around 4.7°C.