Overview
- The Kaltfront crossed Germany on Wednesday, driving a rapid fall in daytime highs of up to about 15°C in parts of the south and replacing hot late‑summer air with cooler, showery conditions.
- The Deutscher Wetterdienst issued dozens of warnings on Wednesday for multi‑hour heavy rain in southern districts, with pockets of up to about 30–35 liters per square metre and a particular focus on the Alpine foothills.
- Northern coastal areas faced convective Kaltluftgewitter with gusty to stormy winds, while models showed 12–30 l/m² in some localized cells and the risk of rapid road flooding in low‑lying spots near heavy showers.
- Most forecast guidance now points to a quick rebuild of high pressure that could bring an 'Altweibersommer' of widespread sunshine and daytime highs in the mid‑20s and locally up to about 32–33°C, but model timing differs and Sunday’s exact pattern is still uncertain.
- The short swing from cool to warm matters because the unusually hot, dry 2026 summer left soils, rivers and groundwater depleted in regions such as Hesse, so any dry, warm spell can deepen drought stress and change flood and fire risks; people should follow DWD warnings for localized hazards.