January in Lyon is the coldest month of the year. In January, the weather in Lyon is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Lyon has 12 rainy, 7 partly cloudy, 6 sunny, and 6 cloudy 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 Lyon.