The Camino del Norte traces Spain’s Atlantic rim, where weather flips between sun, cloud, and rain even within a single day, aided by sea breezes. March, April, and May provide long daylight, moderate warmth, spring greenery, and widespread pilgrim services while avoiding peak summer heat. From the Basque Country through Cantabria, Asturias, and Galicia, temperatures and cloud cover swing frequently, with brisk fronts, intermittent showers, and occasional warm spells shaping daily progress.