In May, Sammamish typically sees daytime highs of 18.2°C and overnight lows around 7.8°C. Compared to the annual average high of 15.1°C, May runs +3.1°C.
May in Sammamish averages a daytime high of 18.2°C and an overnight low of 7.8°C.
May runs +3.1°C compared to Sammamish's annual average high of 15.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.2°C and cooler evenings around 7.8°C.