After months of extreme heat across France, a sudden shift in weather is expected, with Storm Austen potentially bringing torrential rains, thunderstorms, wind, and waves to parts of the country. This change is linked to a deep low-pressure system forming near Ireland, which could lead to heavy rainfall in several regions. Although clouds are already moving into western France starting Saturday, September 26, the heat remains intense, with temperatures well above average for this time of year, according to Météo-France. The first significant weather disturbance is expected on Sunday, September 27, bringing rain to areas like Brittany and the Cotentin. Winds are also expected to strengthen along the English Channel and the Atlantic coast. By Tuesday, September 29, the weather change will become more dramatic, with a very hot day followed by a sharp drop in conditions. Forecasts suggest a new heatwave could push temperatures to around 30 degrees Celsius in the south, with some areas nearing 35 degrees. Departments such as Gard, Lozère, Ardèche, and Hérault are under watch for heavy rain and thunderstorms. Storm Austen, though not yet officially named, is being considered by the United Kingdom, Ireland, and the Netherlands for the 2026-2027 storm season. Between Wednesday, September 30, and Thursday, October 1, a more active weather system could sweep across France from west to east, bringing rain to the Atlantic regions after a largely dry September. The western coast might also experience strong waves, while the south could face sustained thunderstorms near the Gulf of Lions and the Cévennes. However, no major Cévennes weather episode has been confirmed yet. The potential for heavy rain is heightened by the unusually warm Mediterranean Sea, which has increased humidity in the air and could strengthen storms under the right conditions. Météo-France notes that such Mediterranean weather events typically occur between September and mid-December and can cause rapid flooding when thunderstorms become trapped in a region. The risk is further increased by the current state of the soil, with 84% of France experiencing drought conditions on September 20—a rare occurrence at this time of year. Many departments have also faced water restrictions this month, and the dry soil may not absorb much of the expected rainfall, leading to runoff into rivers and low-lying areas. While the situation is not yet a meteorological disaster, the sudden shift in weather is notable, with rain, thunderstorms, wind, and waves expected to return soon after a peak temperature near 35 degrees. Residents in southern France, in particular, are advised to monitor forecasts closely, as it remains unclear whether the region will experience only light rain or a more severe weather episode.