In January, Santa Rosa typically sees daytime highs of 12.0°C and overnight lows around 2.6°C. Compared to the annual average high of 20.4°C, January runs -8.5°C.
January in Santa Rosa averages a daytime high of 12.0°C and an overnight low of 2.6°C.
January runs -8.5°C compared to Santa Rosa's annual average high of 20.4°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 12.0°C and cooler evenings around 2.6°C.