January in Supetar is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Supetar is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Supetar has 11 rainy, 11 sunny, and 9 partly cloudy days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Supetar.