April on the GR 10 feels changeable and spring-like. The Atlantic side sees a lot of cloud, drizzle, and occasional heavy rain, broken by short sunny windows. Higher ground still takes fresh snow during cold snaps, so the big passes can feel wintry even when valleys brighten. As you move east, days trend a bit drier and sunnier, especially near the Mediterranean, yet showers remain common. Temperatures are generally cool to mild at lower elevations and markedly colder on the tops.
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From Hendaye through Olhette, Ainhoa and Bidarray, Atlantic moisture dominates: low cloud, drizzle and light rain are frequent, with some bursts of heavier rain. Short clear spells appear between fronts, bringing a milder feel before cloud builds again.
Crossing the Basque foothills toward Saint-Étienne-de-Baïgorry and Saint-Jean-Pied-de-Port, expect the same on-and-off pattern, with showery days punctuated by brighter breaks. On higher ridges around Phagalcette and Logibar, cold snaps still bring sleet or snow, while valleys swing between damp and briefly warm.
Climbing into Sainte-Engrâce, Lescun, Borce and Etsaut to Gourette, the weather turns more mountain-like. Rain often mixes with snowfall at elevation, and cloud clings to cols; between systems, clear, crisp windows open. Overall it stays cool in the valleys and wintry on the tops, with frequent precipitation.
Through Arrens-Marsous, Cauterets, Luz-Saint-Sauveur and Barèges, April remains unsettled. Showery days and longer wet spells alternate with sunny interludes, and fresh snow is still common on high terrain while valleys see rain.
Around Lac d’Oule, Loudenvielle and Germ toward Bagnères-de-Luchon and the border villages, the mix continues: occasional heavy rain, many showery days, and some warm, brighter windows. Higher cols can flip back to winter during colder outbreaks, with cloud lingering along ridgelines.
Across the Ariège high country—from Melles and Eylie-d’en-Haut through Aulus, Coumebière, Refuge des Bésines, Mérens, L’Hospitalet and Refuge du Rulhe—late-season snow is frequent aloft. Valleys alternate between overcast with drizzle and clearer, calmer days; on the tops, subfreezing spells and new snow remain likely.
Approaching the Cerdagne and Capcir around Ascou, Rouze, Planès and Bolquère, conditions stay changeable but sunnier gaps lengthen. Showers are still common, with occasional moderate rain and lingering snowfall on plateaus during colder surges.
From the Canigou area (Refuge de Mariailles, Vernet-les-Bains) down through Arles-sur-Tech and Las Illas to Banyuls-sur-Mer, the pattern turns milder and generally brighter. There are more dry days and longer sunny stretches, though brief showers or a passing storm can still move through. Overall it feels cool in the mountains and distinctly milder as you near the sea.
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