October in Saint Petersburg is the rainiest month of the year. In October, the weather in Saint Petersburg is typically cold. Average daily high temperature in October is about 7 degrees above zero. On average, Saint Petersburg has 14 rainy, 9 cloudy, 6 partly cloudy, and 2 sunny days in October. The rains are usually moderate. October as well as April and November is considered the most uncomfortable time to visit Saint Petersburg.