January in Santiago de Compostela is the windiest and the coldest month of the year. In January, the weather in Santiago de Compostela is typically warm. Average daily high temperature in January is about 11 degrees above zero. On average, Santiago de Compostela has 16 rainy, 6 sunny, 6 partly cloudy, and 3 cloudy days in January. The rains are usually heavy. January as well as February, March, April, and November is considered the most uncomfortable time to visit Santiago de Compostela.