In April, the weather in Petrozavodsk is typically cold. Average daily high temperature in April is about 6 degrees above zero. On average, Petrozavodsk has 10 partly cloudy, 7 sunny, 7 cloudy, 5 rainy, and 1 snowy day in April. The rains are usually light. April as well as September, October, and November is considered the most uncomfortable time to visit Petrozavodsk.