January in Mooresville is the coldest month of the year. In January, the weather in Mooresville is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Mooresville has 13 sunny, 12 partly cloudy, 4 rainy, and 2 cloudy days in January. The rains are usually light. January as well as February and December is considered the most uncomfortable time to visit Mooresville.