In January, San Francisco typically sees daytime highs of 31.3°C and overnight lows around 17.7°C. Compared to the annual average high of 24.7°C, January runs +6.6°C.
January in San Francisco averages a daytime high of 31.3°C and an overnight low of 17.7°C.
January runs +6.6°C compared to San Francisco's annual average high of 24.7°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 31.3°C and cooler evenings around 17.7°C.