May on the Tour du Mont Blanc is changeable and often unsettled. Cloud and showers are frequent, with short brighter windows between passing systems. Higher ground still sees wintry turns, with fresh snow possible on the cols, while the valleys swing toward a springlike feel on clearer days. Mornings are chilly and afternoons cool to mild, with a dampness lingering after rain. Expect more grey skies than blue, but occasional sunny breaks do appear.
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From Les Houches into Les Contamines, May often brings a spring–winter mix: plenty of cloud, regular light to moderate showers, and snow still likely across higher traverses while the valley floors see rain. Swinging around toward Tré-le-Champ and La Flégère, the skies stay changeable with brief sunny breaks between bands of drizzle or rain and low cloud clinging to ridges. Temperatures sit roughly from near freezing at elevation to the mid-teens lower down. As the loop drops back toward Les Houches, the same stop-start pattern persists, with clearer spells punctuated by returning showers.
Crossing from Les Chapieux to Rifugio Elisabetta, the weather often turns more wintry on the cols, with overcast periods and snow showers at altitude while the approaches see light rain. The descent to Courmayeur can bring a milder, damp feel in the valley, but passing systems still deliver bouts of rain between brighter intervals. Around Rifugio Bonatti, conditions flip quickly: clear views can give way to sleet or snow showers as cloud rebuilds. Expect a cool overall feel, roughly from around freezing to the low teens.
Into Switzerland by La Fouly and Champex-Lac, the changeable theme continues with many cloudier days bringing light rain or drizzle and occasional heavier bursts; higher paths can see sleet or snow. Between fronts, clearer windows offer crisp, brighter conditions and a drier feel. Afternoons generally lift to the low-to-mid teens, while mornings remain chilly and overcast banks linger on ridgelines.
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