October on the GR 20 is highly changeable. Temperatures range widely: lower elevations often reach 17–24°C by day with
nights 14–20°C, while the high ridge sees cooler days of 6–17°C and nights near 0°C or below. Skies alternate between
overcast and bright, with frequent drizzle and moderate rain separated by clearer windows. Heavy bursts are possible,
with daily totals at times around 40–60 mm, but many days stay dry or see only a few millimetres. Overall, expect
milder, sunnier spells toward the coast and cooler, cloudier conditions at altitude.
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From Calenzana, highs typically sit near 17–24°C with mild nights of 14–20°C; skies alternate between overcast and sunny breaks, and showers range from a few millimetres to around 34 mm. Climbing to Ortu, temperatures drop, with highs from about 8–21°C and lows 4–12°C; conditions swing from mainly clear to bouts of heavy rain, and daily totals can spike near 59 mm. Around Carozzu, highs vary 12–23°C and lows 6–14°C, with many overcast days punctuated by clear spells; when rain arrives it can be intense, sometimes exceeding 50 mm.
At Asco Stagnu, highs are 10–21°C with lows 4–12°C; dry intervals are common between rounds of light to moderate rain, with peaks near 17 mm. Through Tighettu the pattern eases somewhat, with highs 7–18°C, lows 0–11°C, and mostly light precipitation, often under 7 mm. Near Ciottulu di i Mori the air turns colder, highs 6–17°C and lows down to -2°C; showers range from drizzle to moderate rain, occasionally around 21 mm, amid frequent cloud.
Across Manganu, highs run 9–21°C with lows 3–11°C; weather flips from clear to prolonged rain, and single days can bring roughly 28 mm. Petra Piana is cooler (highs 6–19°C, lows 0–11°C) and often overcast, with some heavy falls near 39 mm. Around Onda, conditions trend showery with a lot of drizzle; highs 9–22°C, lows 4–12°C, and daily totals typically a few millimetres. Approaching Vizzavone the range broadens, with highs 14–26°C and lows 4–12°C; sunshine alternates with wet spells, and occasional downpours reach about 16 mm.
From Capanelle, October brings highs 6–20°C and lows 1–9°C under changeable skies; light rain and drizzle are frequent, with heavier pulses up to 18 mm. At Prati it stays cool, highs 4–20°C and lows -2–9°C; many overcast days alternate with brief clear windows, and rainfall is usually light to moderate, peaking near 11 mm.
Crossing Usciolu, highs 5–18°C and lows -1–8°C are typical; showers vary from brief drizzle to steady rain, with wet days around 17 mm. Matalza can see the sharpest spikes here: highs 8–20°C, lows 2–10°C, often cloudy, and occasional heavy rain surges bringing roughly 42 mm in a day.
Through Asinau, highs range 4–21°C with lows -1–12°C; conditions swing between overcast and clear, and moderate rain can tally around 18 mm. Around I Paliri, highs 9–22°C and lows 4–14°C pair with frequent cloud and periodic rain, sometimes near 23 mm. The descent to Conca turns milder, highs 14–24°C and lows 8–19°C, with many dry or partly cloudy days punctuated by heavy showers that can reach about 44 mm.
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