In March, the weather in Santiago de Compostela is typically warm. Average daily high temperature in March is about 14 degrees above zero. On average, Santiago de Compostela has 14 rainy, 9 sunny, 5 partly cloudy, and 3 cloudy days in March. The rains are usually heavy. March as well as January, February, April, and November is considered the most uncomfortable time to visit Santiago de Compostela.