August on the Tour du Mont Blanc feels like high summer. Valleys are warm, ridges are cooler, and daylight is long. Mornings often start clear, then puffy cloud builds through midday; brief showers or afternoon thunderstorms pop up on some days, while many others stay dry and bright. Rain, when it comes, is usually short-lived but can be intense, with gusty winds near passes and rapid clearing afterward. Nights are comfortable at lower elevations and can feel crisp higher up.
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Setting out through the French valley and up toward the first cols, mornings are often bright with light winds before cloud builds around midday; a passing shower or rumbling storm may cross the ridges, then skies tend to open again by evening. Many days stay mostly dry with long sunny spells and good visibility between clouds. Later, along the balcony paths and exposed crests toward the finish, breezes pick up near passes with the same risk of pop-up showers that move through quickly. Valley temperatures commonly sit in the mid-20s°C, notably cooler on the cols and at night.
Crossing toward the Italian side over a high pass, the air turns cooler and often windier on the crest, with late-morning cloud build-up and scattered showers or a short thunderstorm possible. Down in the valley, brighter and hotter spells are frequent, but convective cloud can grow fast and bring brief, heavy downpours before sun returns; very occasionally a sharp front can dust the highest ground with a quick flurry even in August. The exposed traverse above the valley sees passing showers arrive with gusty bursts, then evenings often clear and feel fresh. Valley temperatures are typically in the mid- to high-20s°C, much cooler at altitude.
Over the Swiss side the pattern stays changeable but often a touch gentler. From the upper valley through the forests to the lake, mornings are frequently calm and bright, with cloud building toward midday and light to moderate showers moving through quickly. Climbing toward the next col, it becomes breezier and the chance of a short afternoon thunderstorm increases, followed by clearer evenings and wide views. Daytime temperatures in the valleys are usually in the low 20s°C, with cooler air on the passes.
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