October on the Tour du Mont Blanc is changeable and cool. Skies lean overcast much of the time, with frequent light rain or drizzle in the valleys and only brief sunny windows. Higher passes and balcony paths see the first snows, and nights at elevation often dip to freezing. Valley afternoons can still feel mild when the sun breaks through, but it stays chilly on shaded slopes and at altitude. Showers arrive in pulses, and every so often a more organized system brings a spell of steady rain or snow before clearer, calmer weather returns.
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From Les Houches toward Les Contamines, expect a lot of cloud with on‑and‑off drizzle or light rain, punctuated by occasional heavier bursts as fronts pass. When the route re‑enters the French side near Tré‑le‑Champ and across the Balcons to La Flégère, showers are interspersed with early‑season snowfall at higher elevations, with short bright intervals between systems. Closing the loop back to Les Houches, the pattern often returns to cool, grey conditions, though clearer breaks can follow after a wet spell. Valley highs are mostly in the low to mid‑teens Celsius, markedly colder on the ridges with freezing nights possible at altitude.
From Les Chapieux over to Rifugio Elisabetta, cloud and drizzle often thicken into steadier rain, and colder systems bring snow settling around the high huts and passes. Around Courmayeur, clearer windows are more common between passing showers, but the next wave can arrive quickly, with fresh snow on the higher trails. On the traverse to Rifugio Bonatti, conditions trend cooler and more mixed, ranging from light drizzle to snowfall aloft. Valley highs sit in the low to mid‑teens Celsius, dropping to near freezing on exposed cols overnight.
Over the Grand Col Ferret into La Fouly, the weather stays unsettled: long overcast spells, light rain in the valley, and snow higher up, with occasional crisp, clear interludes. Through Champex‑Lac, showers alternate with brighter periods, then toward the Col de la Forclaz, passing fronts bring bouts of rain and, at elevation, snow before partial clearing. Temperatures are generally cool, with valley highs often in the single digits to low teens Celsius and colder air on the passes.
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