January in Nantes is the rainiest and the coldest month of the year. In January, the weather in Nantes is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Nantes has 14 rainy, 6 sunny, 6 partly cloudy, and 5 cloudy days in January. The rains are usually moderate. January as well as February, March, November, and December is considered the most uncomfortable time to visit Nantes.