August in Hachinohe is the warmest month of the year. In August, the weather in Hachinohe is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Hachinohe has 17 rainy, 6 partly cloudy, 5 cloudy, and 3 sunny 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 Hachinohe.