May in Mirny is the rainiest month of the year. In May, the weather in Mirny is typically warm. Average daily high temperature in May is about 19 degrees above zero. On average, Mirny has 21 rainy, 9 sunny, and 1 cloudy day in May. The rains are usually heavy. May as well as February, March, and December is considered the most uncomfortable time to visit Mirny.