March in Sveti Vlas is the rainiest month of the year. In March, the weather in Sveti Vlas is typically cold. Average daily high temperature in March is about 10 degrees above zero. On average, Sveti Vlas has 9 rainy, 8 sunny, 7 cloudy, and 7 partly cloudy days in March. The rains are usually moderate. March as well as January, February, November, and December is considered the most uncomfortable time to visit Sveti Vlas.