May in Mamai is the rainiest month of the year. In May, the weather in Mamai is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Mamai has 21 rainy, 5 sunny, 3 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as March, April, June, and November is considered the most uncomfortable time to visit Mamai.