August in Hakone is the warmest month of the year. In August, the weather in Hakone is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Hakone has 19 rainy, 6 sunny, 4 partly cloudy, and 2 cloudy days in August. The rains are usually heavy. August as well as February, March, April, and June is considered the most uncomfortable time to visit Hakone.