January weather forecast in Sioux Falls

January in Sioux Falls is the snowiest, the cloudiest, and the most freezing month of the year. In January, the weather in Sioux Falls is typically freezing. Average daily high temperature in January is about 3 degrees below zero. On average, Sioux Falls has 9 sunny, 9 cloudy, 9 partly cloudy, and 4 snowy days in January. The snowfalls are usually light.