August in Savannah is the rainiest and the cloudiest month of the year. In August, the weather in Savannah is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Savannah has 21 rainy, 8 sunny, and 2 partly cloudy days in August. The rains are usually heavy. August as well as June and July is considered the most uncomfortable time to visit Savannah.