August in McDonough is the rainiest and the cloudiest month of the year. In August, the weather in McDonough is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, McDonough has 14 rainy, 9 sunny, and 8 partly cloudy days in August. The rains are usually heavy. August as well as January, June, July, and December is considered the most uncomfortable time to visit McDonough.