In May, San Ramon typically sees daytime highs of 22.8°C and overnight lows around 9.5°C. Compared to the annual average high of 20.6°C, May runs +2.2°C.
May in San Ramon averages a daytime high of 22.8°C and an overnight low of 9.5°C.
May runs +2.2°C compared to San Ramon's annual average high of 20.6°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 22.8°C and cooler evenings around 9.5°C.