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 9 sunny, 9 partly cloudy, 7 rainy, 5 cloudy, and 1 snowy day in December. The rains are usually moderate. December as well as January, February, March, and November is considered the most uncomfortable time to visit The Sunny Beach.