July on the GR 20 is warm to hot by day and mild to cool at night, with temperature driven strongly by altitude. Daytime
highs commonly reach 24–30°C, while nights range from about 10–20°C. Skies alternate between clear and partly cloudy
with periodic overcast. Short, localized showers interrupt generally dry spells; most days see 0–2 mm, but isolated
downpours can deliver 10–20 mm. Sunshine is frequent between passing clouds, and the southern end tends to feel hotter
while the highest crests stay a few degrees cooler.
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From Calenzana the month starts warm, with highs around 22–30°C and nights 17–25°C under a mix of clear and partly cloudy skies; brief drizzle is possible near 1 mm. Climbing toward Ortu and Carozzu, days moderate to roughly 19–25°C and nights cool to 11–17°C. Showers become more frequent, and occasional bursts can bring around 7–9 mm amid sunny breaks.
Around Asco Stagnu and Tighettu, highs sit near 18–27°C with nights 10–17°C as conditions swing between overcast and mainly clear. Intermittent drizzle or rain appears, with daily totals at times reaching 5–9 mm. At Ciottulu di i Mori it is cooler at 16–25°C by day and 9–16°C at night, generally dry but with a single wet spell near 8 mm possible.
Crossing Manganu and Petra Piana, expect alternating sunny stretches and cloud build-ups with highs 17–27°C and lows 8–15°C. Local downpours can peak near 18 mm at Manganu and about 5 mm at Petra Piana. Through Onda to Vizzavone it warms again to roughly 20–30°C by day and 13–20°C at night, with occasional showers; isolated days can see 7–10 mm, but many remain dry.
From Capanelle to Prati the weather is generally fair with frequent clear periods; highs run 18–28°C and lows 8–18°C. Brief showers pass through at times, usually 0–3 mm but once near 6 mm. Overcast spells intermittently interrupt sunshine.
Along Usciolu, daytime temperatures hover near 19–26°C with nights 7–16°C. Skies vary from mainly clear to overcast with scattered showers, and a single day may deliver up to 8 mm. Matalza is more volatile, with highs 14–27°C and occasional heavy rain reaching about 21 mm alongside several lighter 5–8 mm events.
Approaching Asinau, warm days of 16–27°C and cool nights of 7–16°C come with sporadic showers up to 5 mm. Around I Paliri, warmer spells appear, with daytime peaks up to 33°C and isolated storm totals near 11 mm. The final descent to Conca trends hot and mostly dry, with highs 26–34°C, nights 18–23°C, and only occasional light drizzle.
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