May in Zheleznogorsk-Ilimsky is the rainiest and the windiest month of the year. In May, the weather in Zheleznogorsk-Ilimsky is typically warm. Average daily high temperature in May is about 10 degrees above zero. On average, Zheleznogorsk-Ilimsky has 17 rainy, 6 partly cloudy, 4 sunny, and 4 cloudy days in May. The rains are usually light. May as well as January, February, April, and September is considered the most uncomfortable time to visit Zheleznogorsk-Ilimsky.