In May, San Francisco typically sees daytime highs of 21.2°C and overnight lows around 8.8°C. Compared to the annual average high of 24.7°C, May runs -3.5°C.
May in San Francisco averages a daytime high of 21.2°C and an overnight low of 8.8°C.
May runs -3.5°C compared to San Francisco's annual average high of 24.7°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 21.2°C and cooler evenings around 8.8°C.