In April, the weather in Kurilsk is typically cold. Average daily high temperature in April is about 3 degrees above zero. On average, Kurilsk has 10 cloudy, 8 rainy, 6 sunny, 3 snowy, and 3 partly cloudy days in April. The rains are usually heavy. April as well as May, October, November, and December is considered the most uncomfortable time to visit Kurilsk.