August in Atami is the hottest month of the year. In August, the weather in Atami is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Atami has 18 rainy, 5 partly cloudy, 4 sunny, and 4 cloudy days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Atami.