Weather

Friday 29: Fog along the slopes until mid-morning, then clear spells appear. Formation of cumulus clouds above 2500m on the southern slopes from midday, while the weather will be fine elsewhere. The wind is light from the south, strengthening and shifting to the southwest at 30 to 40 km/h at all altitudes in the afternoon. Temperatures in the valley bottom from 12 to 19°, at 2000m from 4 to 9°, at 2500m from 1 to 6°. The sky becomes overcast by late afternoon with a few thundery showers starting from 5 PM. In the evening (9 PM) rain will appear, becoming lighter in the middle of the night around 2–3 AM. The rain-snow limit will be at 2400m. The wind is from the west at 30 km/h and 50 km/h from 2500m upward, turning to northwest at 30 km/h at all altitudes by the end of the night, stopping precipitation on the Italian side. Temperatures at 2000m drop to 4° (Windchill -1°) and at 2500m to 1° (Windchill -7°), with traces of snow at 2600m and 10 cm at 3000m.

Saturday 30: Fog along the slopes at all altitudes, then some clear spells; sunny everywhere in the afternoon and evening. The wind comes from the northwest at 15 to 25 km/h between 1500–2500m. Temperatures at 2000m from 4 to 10° in the afternoon and at 2500m from 1 to 6°. The night will be clear and starry, with very light wind; temperatures at 2500m: 3° and at 2000m: -1°.

Sunday 31: Fine weather, cumulus clouds in the afternoon, one brief shower possible in the evening. Wind shifting to light southerly at all altitudes. Temperatures at 2000m rising towards 14°, at 2500m to 11°. In Chamonix: from 8 to 26°.