In May, Vallejo typically sees daytime highs of 22.5°C and overnight lows around 8.9°C. Compared to the annual average high of 20.8°C, May runs +1.7°C.
May in Vallejo averages a daytime high of 22.5°C and an overnight low of 8.9°C.
May runs +1.7°C compared to Vallejo's annual average high of 20.8°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 22.5°C and cooler evenings around 8.9°C.