January in Sandanski is the coldest month of the year. In January, the weather in Sandanski is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Sandanski has 12 partly cloudy, 10 sunny, 7 rainy, and 2 cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Sandanski.