September on the Tour du Mont Blanc is changeable and often beautiful between quick-moving showers. Expect a mix of bright spells and overcast stretches, with occasional bouts of heavier rain when fronts pass through. On cold snaps, the highest cols can see the first dustings of snow while valleys stay wet rather than white. Days feel cool to mild overall, with valley afternoons often in the mid‑teens to low 20s °C and much colder on the ridges. Mornings start crisp, cloud can cling to slopes, and visibility shifts through the day as systems slide past.
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Starting out around the Chamonix valley, mornings are often cool with low cloud, and the first climbs can bring light drizzle before brighter windows open. Passing showers are common and can briefly turn heavy, while higher paths occasionally catch flurries during colder outbreaks; valley afternoons are usually in the mid‑teens to low 20s °C. Later, on the balcon trails above the valley, the pattern remains changeable: overcast layers break at times for views, but light drizzle and periods of steady rain still come through. Returning toward the finish, conditions swing between clearer, dry days and damp, grey spells, with the highest sections feeling brisk and sometimes wintry.
Over the border the weather flips between overcast and sunny intervals, with frequent light showers and the odd heavier band as systems move along the range. Around the high refuges, cold snaps can bring sleet or a brief snowfall, while the valleys around Courmayeur often find milder, brighter interludes. The sequence tends to alternate: a showery day with low cloud on the passes, then a clearer spell with longer views before the next disturbance. Temperatures in the valleys generally sit in the mid‑teens to low 20s °C, dropping sharply on the cols.
Crossing into Switzerland, conditions often stabilize for stretches, bringing mostly dry walking with high cloud and good breaks of sun. Showers still pass at times, and some fronts deliver steadier rain, especially near Champex and the Forclaz, with cloud lowering onto the ridges. Between systems, air feels fresh and visibility improves, particularly in the afternoons. Daytime temperatures commonly hover in the mid‑teens °C in the valleys, with cooler, brisk conditions on higher traverses.
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