December in Sandanski is the windiest month of the year. In December, the weather in Sandanski is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Sandanski has 14 sunny, 8 rainy, 8 partly cloudy, and 1 cloudy day in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Sandanski.