In May, Bismarck typically sees daytime highs of 20.0°C and overnight lows around 5.1°C. Compared to the annual average high of 11.9°C, May runs +8.1°C.
May in Bismarck averages a daytime high of 20.0°C and an overnight low of 5.1°C.
May runs +8.1°C compared to Bismarck's annual average high of 11.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 20.0°C and cooler evenings around 5.1°C.