January in Santiago de Compostela is the rainiest, the windiest, the cloudiest, 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 10 degrees above zero. On average, Santiago de Compostela has 26 rainy, 4 sunny, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Santiago de Compostela.