January in Mont St Michel is the coldest month of the year. In January, the weather in Mont St Michel is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Mont St Michel has 19 rainy, 6 cloudy, 5 sunny, and 1 partly cloudy day in January. The rains are usually moderate. January as well as February, May, November, and December is considered the most uncomfortable time to visit Mont St Michel.