August in Obihiro is the rainiest and the warmest month of the year. In August, the weather in Obihiro is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Obihiro has 16 rainy, 8 cloudy, 4 partly cloudy, and 3 sunny days in August. The rains are usually heavy. August as well as March, April, May, and July is considered the most uncomfortable time to visit Obihiro.