May in Kassala is the hottest month of the year. In May, the weather in Kassala is typically hot. Average daily high temperature in May is about 41 degrees above zero. On average, Kassala has 26 sunny, 4 partly cloudy, and 1 rainy day in May. The rains are usually light. May as well as April, June, July, and August is considered the most uncomfortable time to visit Kassala.