January in Indianapolis is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Indianapolis is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Indianapolis has 9 cloudy, 8 partly cloudy, 6 sunny, 4 rainy, and 4 snowy days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Indianapolis.