January in Pessac is the coldest month of the year. In January, the weather in Pessac is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Pessac has 16 rainy, 7 sunny, 5 cloudy, and 3 partly cloudy days in January. The rains are usually heavy. January as well as February, November, and December is considered the most uncomfortable time to visit Pessac.