This route crosses Atlantic mountains in Asturias and rolling Galician hills, where fast‑moving showers alternate with bright breaks and breezy conditions. May, June, and September often align with longer days, open services, and fewer heat spikes than peak midsummer along the Camino Primitivo. Outside those months, walking remains feasible, though heavier rain, cooler or hotter spells, fog on ridges, and shorter daylight windows feature more frequently.