Great St Bernard Pass

A radiant day this Saturday, followed by a calm evening and mild night. Weather favorable for all outdoor activities. Sunday will be mostly sunny. Some cumulus clouds developing in the mountains during the afternoon. Slight thunderstorm risk over the southern Valais Alps, persisting into the evening and overnight into Monday. Freezing level (0°C) above 4800 meters. Forecast temperatures in the Rhône Valley: lows 16 to 19°C, highs 32 to 35°C. In resorts around 1500m: lows 13 to 17°C, highs 27 to 29°C. On summits: 14/25°C at 2000m, 9/15°C at 3000m. Freezing level: 4900 meters. Moderate daytime breeze in the Rhône Valley. Moderate westerly winds in high mountain areas.

Monday, scorching weather but more unstable, with rapidly developing imposing and threatening cloud formations over mountainous areas. Thunderstorms expected in the afternoon in the Alps, with some spillover into lowland regions. Storms may be locally severe. Highs of 32 to 34°C, 27°C at 1000m. Tuesday, continuation of scorching and moderately unstable weather, favorable for afternoon thunderstorm development in the Alps. Local spillover possible into lowland regions. Highs of 32 to 33°C, 27°C at 1000m. Wednesday, very hot weather with blazing sun and temperatures ranging between 33 and 35°C at low altitudes. Temporary decrease in thunderstorm risk with cells generally confined to Alpine areas. Local spillover into lowland regions not completely ruled out. Thursday, possible passage of a rain-thunderstorm front by late afternoon or evening, potentially bringing precipitation to all regions. Intensity of the deterioration still uncertain. Highs of 28 to 30°C, 23°C at 1000m. From Friday through the weekend of July 5-6, forecast remains unreliable. Potentially changeable weather alternating between prolonged clear spells in lowland areas and more mixed skies in mountainous regions with possible showers. Temperatures likely more comfortable.