In January, Sioux City typically sees daytime highs of -2.3°C and overnight lows around -13.8°C. Compared to the annual average high of 15.8°C, January runs -18.1°C.
January in Sioux City averages a daytime high of -2.3°C and an overnight low of -13.8°C.
January runs -18.1°C compared to Sioux City's annual average high of 15.8°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -2.3°C and cooler evenings around -13.8°C.