In January, Sioux Falls typically sees daytime highs of -5.0°C and overnight lows around -16.2°C. Compared to the annual average high of 13.7°C, January runs -18.7°C.
January in Sioux Falls averages a daytime high of -5.0°C and an overnight low of -16.2°C.
January runs -18.7°C compared to Sioux Falls's annual average high of 13.7°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near -5.0°C and cooler evenings around -16.2°C.