August in Baton Rouge is the rainiest and the cloudiest month of the year. In August, the weather in Baton Rouge is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Baton Rouge has 22 rainy, 8 sunny, and 1 partly cloudy day in August. The rains are usually heavy. August as well as June and July is considered the most uncomfortable time to visit Baton Rouge.