Overview
- A fast‑moving cold front produced a sharp drop in daytime highs — as much as about 15°C at some southern stations — turning 30°C days into roughly 18–23°C, according to DWD and regional reports on Wednesday.
- The Deutscher Wetterdienst issued official multi‑county warnings for prolonged heavy rain and thunderstorms in parts of southern Germany, with local amounts around 30–35 l/m² and several areas raised to warning level 2 because of flash‑flood risk.
- Nights have cooled markedly with DWD guidance that inland and mid‑elevation locations may see single‑digit lows and pockets of ground frost that could harm sensitive late crops and gardens.
- Operational models and forecasters now expect a rebuilding Azores/high pressure to bring milder, often dry late‑summer weather this weekend and into next week with widespread highs above 20°C and localized 25–32°C, but model disagreement leaves the timing and impact of a possible Sunday frontal push unsettled.
- Meteorologists warn that the brief warm spell will not erase the season‑long rainfall deficit and low river levels and that continued dry conditions could trigger renewed extreme low flows on the Rhine later in September, affecting navigation and water supply for agriculture.