In May, Petaluma typically sees daytime highs of 19.8°C and overnight lows around 8.5°C. Compared to the annual average high of 18.5°C, May runs +1.2°C.
May in Petaluma averages a daytime high of 19.8°C and an overnight low of 8.5°C.
May runs +1.2°C compared to Petaluma's annual average high of 18.5°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 19.8°C and cooler evenings around 8.5°C.