July on the Tour du Mont Blanc brings summer warmth in the valleys and fresher air on the high ground. Expect a shifting mix of sunshine, cloud, and passing showers, with many mornings starting fair before cloud builds. Short, sharp afternoon thunderstorms are common and can deliver brief heavy rain; between them, long dry stretches feel bright and pleasant. During unstable spells a quick chill can sweep over the highest cols, and a stray flurry is not impossible, while lower elevations stay comfortable. Winds vary from light to breezy on exposed ridges. Overall it feels lively rather than settled, with quick changes but plenty of usable weather.
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Starting in the valleys around Les Houches and up to Les Contamines, days are mostly mild to warm, with bright starts giving way to building cloud and scattered showers or a rumble later on. When the route returns above the Chamonix valley near Tré-le-Champ and La Flégère, the air feels cooler and more changeable on the ridges, with quick shifts between sunny breaks and overcast, and the risk of a brief downpour if a storm pops up. A stray cold pulse can drop temperatures on the highest balconies enough for a short-lived flurry. Descending back toward Les Houches, conditions turn warmer and often a bit humid, with clearer interludes between passing showers.
From Les Chapieux over the high pass to Rifugio Elisabetta, expect quick swings: low cloud can cling to the col, then lift to spells of sun, with light showers never far away. The descent to Courmayeur is usually brighter and warmer in the middle of the day, though afternoon thunderheads can build rapidly over the massif and bring short, heavy bursts of rain. Along Val Ferret toward Rifugio Bonatti, the pattern stays lively—sunny windows alternate with overcast stretches, and storms can be intense when they arrive. Temperatures are generally mild to warm, turning noticeably cooler on exposed ground during squalls.
Through La Fouly and the Swiss Val Ferret, mornings are often calm with broken cloud, followed by scattered light rain or a rumble developing later. Around Champex-Lac, longer dry spells appear between disturbances, but July can still produce a few vigorous thunderstorms with brief downpours. Climbing toward the Col de la Forclaz, winds can funnel across the ridge and the air cools; on rare unstable outbreaks, the highest points may see a quick dusting before conditions brighten again. Overall it feels mostly mild to warm at valley level, with a cooler feel on the passes.
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