January in Sayansk is the most freezing month of the year. In January, the weather in Sayansk is typically freezing. Average daily high temperature in January is about 16 degrees below zero. On average, Sayansk has 21 cloudy, 5 snowy, 4 sunny, and 1 partly cloudy day in January. The snowfalls are usually light. January as well as February, April, October, and December is considered the most uncomfortable time to visit Sayansk.