April in Zheleznogorsk-Ilimsky is the windiest month of the year. In April, the weather in Zheleznogorsk-Ilimsky is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Zheleznogorsk-Ilimsky has 12 partly cloudy, 6 sunny, 6 cloudy, 4 rainy, and 2 snowy days in April. The rains are usually light.