In January, Santa Rosa typically sees daytime highs of 31.9°C and overnight lows around 15.6°C. Compared to the annual average high of 23.4°C, January runs +8.5°C.
January in Santa Rosa averages a daytime high of 31.9°C and an overnight low of 15.6°C.
January runs +8.5°C compared to Santa Rosa's annual average high of 23.4°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 31.9°C and cooler evenings around 15.6°C.