In April, the weather in Kotlas is typically cold. Average daily high temperature in April is about 4 degrees above zero. On average, Kotlas has 15 rainy, 12 cloudy, 1 snowy, 1 sunny, and 1 partly cloudy day in April. The rains are usually moderate. April as well as January, February, September, and October is considered the most uncomfortable time to visit Kotlas.