Overview
- Forecasters say Monday is the final widespread warm day with highs generally 25–33°C and local mid‑30s in the southwest.
- Weather services and regional outlets report that southern and western Alpine areas face the highest afternoon and evening thunderstorm risk with heavy rain, hail and gusty winds.
- The Deutscher Wetterdienst warns that thunderstorms where they form can produce torrential downpours and localized flash‑flooding along with storm gusts and small hail.
- A cold front pushed by an Atlantic low will arrive from the northwest starting Tuesday and can drop temperatures by about 15°C across parts of the country within 24 hours while winds strengthen on the coasts.
- Expect unsettled, cooler weather through the week with further frontal systems possible by Friday and an overall seasonally warm September trend noted by forecasters as background context.