January in Sveti Vlas is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Sveti Vlas is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Sveti Vlas has 8 sunny, 8 cloudy, 8 partly cloudy, 6 rainy, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, November, and December is considered the most uncomfortable time to visit Sveti Vlas.