August in Atlanta is the hottest month of the year. In August, the weather in Atlanta is typically hot. Average daily high temperature in August is about 34 degrees above zero. On average, Atlanta has 15 sunny, 8 rainy, 6 partly cloudy, and 2 cloudy days in August. The rains are usually moderate. August as well as January, February, May, and June is considered the most uncomfortable time to visit Atlanta.