January in La Rochelle is the coldest month of the year. In January, the weather in La Rochelle is typically cold. Average daily high temperature in January is about 9 degrees above zero. On average, La Rochelle has 13 rainy, 9 partly cloudy, 5 cloudy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit La Rochelle.