January in Sines is the rainiest and the cloudiest month of the year. In January, the weather in Sines is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, Sines has 11 rainy, 10 sunny, and 10 partly cloudy days in January. The rains are usually heavy. January as well as February, November, and December is considered the most uncomfortable time to visit Sines.