January in Miamisburg is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Miamisburg is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Miamisburg has 10 cloudy, 9 partly cloudy, 4 rainy, 4 snowy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, April, and November is considered the most uncomfortable time to visit Miamisburg.