August in Wakayama is the hottest month of the year. In August, the weather in Wakayama is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Wakayama has 12 rainy, 9 sunny, 7 partly cloudy, and 3 cloudy days in August. The rains are usually heavy. August as well as January, February, March, and June is considered the most uncomfortable time to visit Wakayama.