August in Sumare is the sunniest month of the year. In August, the weather in Sumare is typically warm. Average daily high temperature in August is about 27 degrees above zero. On average, Sumare has 20 sunny, 6 partly cloudy, 4 rainy, and 1 cloudy day in August. The rains are usually light. August as well as June and July is considered the most comfortable time to visit Sumare.