In January, Vallejo typically sees daytime highs of 13.1°C and overnight lows around 3.7°C. Compared to the annual average high of 20.8°C, January runs -7.7°C.
January in Vallejo averages a daytime high of 13.1°C and an overnight low of 3.7°C.
January runs -7.7°C compared to Vallejo's annual average high of 20.8°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 13.1°C and cooler evenings around 3.7°C.