In January, Santa Rosa typically sees daytime highs of 30.8°C and overnight lows around 19.7°C. Compared to the annual average high of 25.7°C, January runs +5.1°C.
January in Santa Rosa averages a daytime high of 30.8°C and an overnight low of 19.7°C.
January runs +5.1°C compared to Santa Rosa's annual average high of 25.7°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 30.8°C and cooler evenings around 19.7°C.