January in Grenoble is the snowiest and the coldest month of the year. In January, the weather in Grenoble is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Grenoble has 9 rainy, 9 partly cloudy, 7 sunny, 5 cloudy, and 1 snowy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Grenoble.