October in Petrozavodsk is the rainiest month of the year. In October, the weather in Petrozavodsk is typically cold. Average daily high temperature in October is about 5 degrees above zero. On average, Petrozavodsk has 16 rainy, 14 cloudy, and 1 sunny day in October. The rains are usually moderate. October as well as April and November is considered the most uncomfortable time to visit Petrozavodsk.