In May, Santa Rosa typically sees daytime highs of 18.9°C and overnight lows around 5.1°C. Compared to the annual average high of 23.4°C, May runs -4.5°C.
May in Santa Rosa averages a daytime high of 18.9°C and an overnight low of 5.1°C.
May runs -4.5°C compared to Santa Rosa's annual average high of 23.4°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 5.1°C.