June on the GR 20 is changeable. Lower elevations see mild to warm afternoons around 20–27°C with nights 13–18°C, while
the highest ridges are cooler with highs 11–19°C and lows 2–12°C. Skies often flip between overcast and sunny spells.
Showers are common, ranging from drizzle to brief downpours delivering 10–40 mm, especially over the central mountains,
yet dry windows are frequent. Toward the south and near the coast it usually turns warmer, with highs 25–31°C and
limited rainfall.
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At the northern approach, days sit around 20–25°C with nights 13–18°C. Skies shift between overcast and clear, and showers range from drizzle to heavy falls near 22 mm. As altitude increases, highs ease to 14–20°C with nights 4–11°C, and cloud and drizzle become more frequent.
Through the high cirques, days run 14–22°C (occasionally 27°C) with nights 6–15°C under changeable cloud. Drizzle and light rain come and go, though some stretches stay dry. Around the loftiest cols temperatures drop to 11–19°C by day and 2–12°C at night, and short, intense bursts can deliver about 28 mm in a day.
Across the central plateau toward the main pass, sunshine windows mix with overcast spells and scattered showers. Heavy rain is possible here, with daily totals around 29–41 mm, while many hours remain dry. Approaching the mid-island forests, highs reach 21–27°C and most showers are lighter, though a single fall near 13 mm can still occur.
South of the pass, days are generally 15–22°C with nights 7–13°C. Skies alternate between overcast and partly cloudy, with occasional light rain or drizzle. Daily totals usually stay low but can reach about 8–12 mm.
Along the high ridge beyond, temperatures vary from 15–23°C by day to 4–15°C at night. The pattern remains mixed, with sunny intervals and periodic moderate rain. Some days bring 10–13 mm, while others remain dry.
Farther on, warmth increases with highs near 16–25°C and lows 7–15°C. Weather switches quickly between clear spells and showers, and the heaviest days deliver about 31 mm.
On the final stretch toward the coast, the air turns warm to hot. Highs often reach 25–31°C with mild nights 10–22°C. Rain is infrequent but possible, with isolated falls around 11–16 mm under overcast spells, otherwise long dry stretches with sunshine.
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