Overview
- The Deutscher Wetterdienst confirmed on Monday that a southwest high called 'Olaf' will drive a heat build starting Tuesday and push temperatures up quickly over several days.
- Official DWD guidance expects midweek daytime highs commonly around 37–39°C with the hottest values focused on the Upper Rhine, Franconia and parts of Bavaria and reduced nighttime cooling in cities.
- Some individual model and ensemble runs project spikes above 40°C into early August but meteorologists warn those long‑range signals are unstable and beyond the DWD's reliable ~10‑day forecast window.
- Shifts into and out of the hot spell raise the risk of strong to potentially severe thunderstorms that can bring heavy rain, hail and damaging gusts, and the weekend already saw widespread showers and local storms.
- Persistent dry soils and precipitation deficits in parts of the southwest and east heighten wildfire and crop stress risks, raise the chance of tropical nights, and increase the need for public preparedness for heat and storm impacts.