In January, San Ramon typically sees daytime highs of 11.5°C and overnight lows around 3.5°C. Compared to the annual average high of 20.6°C, January runs -9.1°C.
January in San Ramon averages a daytime high of 11.5°C and an overnight low of 3.5°C.
January runs -9.1°C compared to San Ramon's annual average high of 20.6°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 11.5°C and cooler evenings around 3.5°C.