January in Cannes is the cloudiest and the coldest month of the year. In January, the weather in Cannes is typically warm. Average daily high temperature in January is about 11 degrees above zero. On average, Cannes has 15 sunny, 12 partly cloudy, and 4 rainy days in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Cannes.