August in Sennar is the rainiest and the cloudiest month of the year. In August, the weather in Sennar is typically hot. Average daily high temperature in August is about 33 degrees above zero. On average, Sennar has 16 rainy, 10 partly cloudy, 4 cloudy, and 1 sunny day in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Sennar.