In July, South San Francisco typically sees daytime highs of 20.7°C and overnight lows around 11.4°C. Compared to the annual average high of 17.7°C, July runs +3.0°C.
July in South San Francisco averages a daytime high of 20.7°C and an overnight low of 11.4°C.
July runs +3.0°C compared to South San Francisco's annual average high of 17.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 20.7°C and cooler evenings around 11.4°C.