August in Beppu is the warmest month of the year. In August, the weather in Beppu is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Beppu has 22 rainy, 8 sunny, and 1 partly cloudy day in August. The rains are usually heavy. August as well as January, February, March, and June is considered the most uncomfortable time to visit Beppu.