May in Bor is the rainiest month of the year. In May, the weather in Bor is typically cold. Average daily high temperature in May is about 8 degrees above zero. On average, Bor has 22 rainy, 7 cloudy, and 2 sunny days in May. The rains are usually moderate. May as well as January, February, April, and September is considered the most uncomfortable time to visit Bor.