January in Grand Baie is the rainiest and the cloudiest month of the year. In January, the weather in Grand Baie is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Grand Baie has 19 rainy, 9 sunny, and 3 partly cloudy days in January. The rains are usually heavy. January as well as February is considered the most uncomfortable time to visit Grand Baie.