September on the GR 20 brings a blend of warmth and changeable mountain weather. Lower elevations often reach 20–32°C,
while higher ridges are cooler with daytime highs 15–22°C and nights 4–10°C. Skies alternate between clear sunshine,
patchy cloud, and overcast layers. Light drizzle is frequent, and some days turn wet with localized downpours over 30
mm. Calm spells sit between systems, but conditions can shift quickly along the ridge.
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From Calenzana, days vary between clear and overcast, with highs around 21–32°C and warm nights near 17–25°C; brief showers appear on some days, typically up to 5 mm. Climbing to Ortu, conditions cool noticeably, with frequent drizzle and light rain; highs range 13–26°C, lows 7–15°C, and wettest days bring around 5 mm. Around Carozzu the pattern turns more unsettled, with several overcast spells and heavy rain peaking near 23 mm, though there are also brighter breaks; temperatures run 16–26°C by day and 8–16°C at night.
At Asco Stagnu, mixed cloud dominates, punctuated by dry, clear windows and occasional downpours reaching about 27 mm; daytime temperatures sit 14–23°C with nights 7–15°C. Through Tighettu, passing showers are common with totals up to 12 mm, and temperatures around 14–22°C by day and 8–14°C by night. Ciottulu di i Mori is the coolest stretch, often overcast but with some clear days; highs stay near 13–19°C, lows dip to 4–10°C, and rain occasionally approaches 12 mm.
By Manganu, light drizzle and overcast intervals alternate with clear spells, with highs 15–23°C, lows 7–14°C, and most wet days under 3 mm. Petra Piana is more variable, mixing drizzle with moderate rain that can reach roughly 11 mm; temperatures range 10–21°C with nights 5–11°C. Continuing via Onda to Vizzavone, intermittent showers bring up to 7–8 mm, but many days are dry and sunny; highs rise from roughly 14–24°C to 18–27°C, with cool nights 7–18°C.
From Capanelle, conditions fluctuate between mainly clear and overcast with light drizzle at times; highs sit 12–23°C, lows 6–13°C, and daily rain is generally light, occasionally near 4 mm. Across Prati, cloud and drizzle are frequent, punctuated by dry breaks; temperatures run 8–22°C by day and 4–14°C by night, and a wettest spell can deliver around 17 mm.
Usciolu remains changeable with overcast periods and episodes of light to moderate rain totaling up to about 6 mm; highs vary 8–23°C with cool nights 3–13°C. Matalza trends drier, mostly overcast or bright with just occasional drizzle, though an isolated day can bring around 10 mm; daytime temperatures span 13–27°C with nights 4–16°C.
At Asinau, mixed overcast and clear intervals give way at times to heavy rain, peaking near 33 mm; highs range 14–22°C and lows 5–13°C. I Paliri alternates warm, dry days with showers, and can see significant bursts around 24 mm and about 20 mm; temperatures sit 17–27°C by day and 7–16°C by night. Approaching Conca, warmth increases with highs 20–31°C and nights 14–21°C, and most days are dry or just a brief drizzle, though one day can deliver heavy rain near 34 mm.
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