In May, the weather along the Camino de Muxía & Finisterre walk is usually a little changeable, but mostly mild. It's typically between 18°C at the hottest and 7°C at the coldest.
Rain is pretty common on this route, so you might experience it often. There's a good chance you'll also see some cloudy and sunny days. Sometimes, there can be heavy showers, so be ready for those, even though they happen less often.
Santiago de Compostela and Muxía might occasionally have heavy rain, but this is less likely in other areas. You will see more mixtures of sun and cloud as you get closer to Fisterra.
Also, remember that the amount of rainfall can also change a lot. The highest rainfall is usually in Muxía, but normally, the average is about 2.2 mm each day.
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