In April, the weather in Novoaltaysk is typically cold. Average daily high temperature in April is about 9 degrees above zero. On average, Novoaltaysk has 13 rainy, 10 cloudy, 4 sunny, and 3 partly cloudy days in April. The rains are usually light. April as well as January, February, October, and December is considered the most uncomfortable time to visit Novoaltaysk.