August in New Orleans is the cloudiest and the hottest month of the year. In August, the weather in New Orleans is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, New Orleans has 19 rainy, 6 sunny, 4 partly cloudy, and 2 cloudy days in August. The rains are usually heavy. August as well as June and July is considered the most uncomfortable time to visit New Orleans.