May on the GR 20 is changeable spring. Days range from cool to warm, with highs often 12-22°C at mid elevation and
locally 24-26°C in the south, while the highest ridges can stay much cooler. Nights commonly sit 0-10°C and can dip
below 0°C on the loftiest cols. Cloud is frequent, with brief sunny windows between waves of drizzle and showers; some
days bring moderate to heavy rain delivering 20-35 mm. Cold spells still trigger late snowfall on the high passes.
Overall it is a stop-start pattern of unsettled spells punctuated by clearer breaks.
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From Calenzana upward, conditions are mixed: overcast spells and drizzly intervals are common, punctuated by brief clear breaks. Highs vary roughly 14-22°C with nights 10-15°C, but some days see heavy rain around 35 mm. Climbing toward Ortu and on to Carozzu, temperatures drop to highs near 6-16°C with nights 0-9°C, and showers become more frequent, ranging from light drizzle to moderate or heavy rain around 20-24 mm; cold snaps can bring snow at elevation.
Across Asco Stagnu to Tighettu, skies alternate between partial sun and showers, with highs 9-23°C and lows 1-14°C; a few incursions include snowfall. Over the highest crests, swings are sharper, with highs near 2-23°C and nights down to -3°C, and precipitation can spike to about 28 mm, sometimes as heavy snowfall. At Ciottulu di i Mori, the coldest bursts drop nights to -7°C with highs 1-15°C, under overcast periods, drizzle, moderate rain up to 25 mm, and fresh snow during colder outbreaks.
Continuing across Manganu and Petra Piana, weather stays mostly overcast with frequent light drizzle and occasional moderate rain around 10-11 mm; highs run 8-16°C with lows -2-7°C. Toward Onda, cloud remains prevalent with intermittent light rain and heavy drizzle, highs 11-18°C and lows 2-11°C, with some days near 9 mm. Approaching Vizzavone, conditions remain changeable, from overcast to brief bright spells, with highs 16-22°C, lows 7-12°C, and showers at times around 10 mm.
From Capanelle to the ridge by Prati and Usciolu, skies are often overcast with recurring drizzle and occasional sunny breaks. Highs span about 8-19°C at first, then 6-18°C to 4-18°C, with lows 0-9°C and brief dips to -1°C; rainfall ranges from light to moderate, but single events can surge to 13 mm, and at Capanelle can reach about 34 mm.
Across Matalza to Asinau, mixed cloud and showers dominate, with highs 5-22°C and lows 0-10°C at Matalza; rainfall varies from light drizzle to moderate bursts around 19 mm, and there is a light snowfall episode. At Asinau, the unsettled pattern persists with frequent light rain and some heavier spells; highs 3-16°C, lows -3-7°C, with totals at times near 26 mm and a day of heavy snowfall.
Beyond I Paliri to Conca, overcast conditions and passing drizzle alternate with clearer intervals. At I Paliri, highs 13-22°C and lows 0-11°C accompany showers that on occasion intensify to moderate rain near 23 mm. Near Conca, it turns warmer and generally drier, with highs 15-26°C and lows 9-19°C, mostly fair or partly cloudy conditions, and only isolated moderate rain near 15 mm.
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