December in Sozopol is the windiest month of the year. In December, the weather in Sozopol is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Sozopol has 11 partly cloudy, 10 sunny, 9 rainy, and 1 cloudy day in December. The rains are usually moderate. December as well as January, February, and March is considered the most uncomfortable time to visit Sozopol.