Roc Blanc

Later today, blazing sun and intense heat, with isolated showers and thunderstorms in the mountains. A clear, warm evening and a starry, very mild night. Thursday will bring another scorching day with plenty of sunshine and very high temperatures in both the plains and the mountains. Cumulus clouds will develop, bringing a few showers and thunderstorms in the mountains in the afternoon, which may occasionally spread to the plains by late afternoon. Thunderstorms will be locally severe. Forecast temperatures in the Rhône lowlands: lows 17 to 21°, highs 33 to 35°. At stations around 1,500 m: lows 14 to 16°, highs 27 to 28°. On the peaks: 16/24° at 2,000 m, 8/14° at 3,000 m. 0° isotherm: 4,500 m. Daytime breezes in the plains and valleys; light to moderate northeasterly winds in the high mountains, with gusts during thunderstorms.

On Friday, sunny and very hot conditions will persist, with highs around 35 degrees in the lowlands and 27 to 29 degrees at an altitude of 1,500 meters. Cumulus clouds will develop, bringing a few isolated showers and thunderstorms over the mountains in the afternoon. On Saturday and Sunday, the weather will remain sunny and very hot, with highs of 35 to 37 degrees in the lowlands and 28 to 30 degrees at an altitude of around 1,500 meters. A few isolated thunderstorms are expected in the mountains in the afternoons, which may become more widespread on Sunday evening and overnight. On Monday, the weather will be hot, muggy, and unstable, with a few showers and thunderstorms possible in all regions. On Tuesday and Wednesday, conditions will be variable to fairly sunny, with a few showers and thunderstorms still possible. Temperatures will be cooler, with highs between 26 and 29 degrees in the lowlands.