July in Sumbawanga is the sunniest and the coldest month of the year. In July, the weather in Sumbawanga is typically warm. Average daily high temperature in July is about 23 degrees above zero. On average, Sumbawanga has 28 sunny and 3 partly cloudy days in July. July as well as June, August, and September is considered the most comfortable time to visit Sumbawanga.