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 18 rainy, 7 partly cloudy, 4 cloudy, and 2 sunny days in January. The rains are usually heavy. January as well as February, March, April, and October is considered the most uncomfortable time to visit Mont St Michel.