In May, Vacaville typically sees daytime highs of 25.9°C and overnight lows around 9.9°C. Compared to the annual average high of 23.0°C, May runs +2.8°C.
May in Vacaville averages a daytime high of 25.9°C and an overnight low of 9.9°C.
May runs +2.8°C compared to Vacaville's annual average high of 23.0°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 25.9°C and cooler evenings around 9.9°C.