During April, weather along the Camino Olvidado fluctuates considerably. The Basque Country sees a mix of patchy rain and sunshine with occasional heavy rain, while temperatures range from mild to warm. Progressing into Castile and León, the weather continues to shift between sunny spells and bouts of rain. Temperatures generally climb higher as one moves inland, though sporadic showers and cloud cover remain prevalent. Highs can reach the low twenties in some areas, but the trail is frequently punctuated by rainy periods, especially in mountainous stretches.
In Bilbao, the weather during April is varied, with temperatures ranging from 8°C to 22°C. The days can start sunny but often shift to patchy rain with moderate to heavy showers. Despite frequent rain, there are intervals of sunshine contributing to a generally mild climate.
As you move from Güeñes to Nava de Ordunte, temperatures generally hover between 7°C and 19°C. The weather alternates between sunny breaks and significant rainfall, particularly in Nava de Ordunte where showers are abundant. Further along in Bercedo and Quintanilla del Rebollar, sunny intervals gradually dominate, although heavy rains occasionally occur. In Soncillo, both sunshine and rain are common, with highs reaching up to 27°C.
Traveling further into Arroyo de Valdearroyo and Olea, the temperature typically peaks in the low twenties, with a mix of sun and showers. Aguilar de Campoo and Cervera de Pisuerga experience moderate temperatures, with sunny spells interrupted by occasional heavy rains, especially in Cervera de Pisuerga where precipitation can be intense. In Santibáñez de la Peña and Puente Almuhey, while the sun is dominant, heavy rain episodes are not uncommon.
Moving through Cistierna, Boñar, and La Robla, expect mild conditions, with sun and light rains alternating frequently. In Riello and Fasgar, the day often starts sunny but heavy rains can occur, with temperatures reaching highs of 23°C. Finally, in Igüeña, Labaniego, and Congosto, the pattern of sunny interludes and moderate rainfall persists, with the occasional day of heavy showers.
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