August in Grand Baie is the coldest month of the year. In August, the weather in Grand Baie is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Grand Baie has 19 sunny, 7 partly cloudy, and 5 rainy days in August. The rains are usually light. August as well as June, July, September, and October is considered the most comfortable time to visit Grand Baie.