December in The Sunny Beach is the windiest month of the year. In December, the weather in The Sunny Beach is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, The Sunny Beach has 11 partly cloudy, 9 rainy, 9 sunny, and 2 cloudy days in December. The rains are usually moderate. December as well as January, February, and March is considered the most uncomfortable time to visit The Sunny Beach.