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 16 rainy, 7 sunny, 6 partly cloudy, and 2 cloudy days in January. The rains are usually moderate. January as well as February, November, and December is considered the most uncomfortable time to visit La Rochelle.