August in Detroit is the sunniest month of the year. In August, the weather in Detroit is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Detroit has 17 sunny, 10 partly cloudy, and 4 rainy days in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Detroit.