April in Sayansk is the rainiest month of the year. In April, the weather in Sayansk is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Sayansk has 14 rainy, 9 cloudy, 4 sunny, and 3 partly cloudy days in April. The rains are usually light. April as well as January, February, and December is considered the most uncomfortable time to visit Sayansk.