Weather forecast builder for the Camino Viejo

The Camino Viejo from Pamplona to Aguilar de Campoo crosses Atlantic-influenced hills into drier interior valleys, so weather can swing quickly, with rapid flips from damp grey hours to clearer, breezier stretches. May, June, or September often bring milder afternoons, longer daylight, and generally steadier windows between showery spells. Even then, days often alternate between sunshine and cloud with brief downpours, while mornings begin cool and higher ground sometimes sees a wintry touch.

• Winter: Expect many cloudy, damp days with frequent drizzle or light rain, cold nights near freezing, and occasional snow on higher sections.
• Spring: Changeable pattern with alternating sunshine and cloud, frequent showers and brief heavier bursts; cool mornings, mild afternoons, and lingering wintry touches on exposed heights.
• Summer: Mostly warm to hot with long sunny spells; inland valleys heat up, while brief thunderstorms or passing showers occasionally break the dryness.
• Autumn: Mild days and cooler nights under mixed skies; regular dry windows punctuated by showers or steady rain as passing fronts move through.