France's heatwave eases as storms and rain expected by week's end
France will experience gradually easing temperatures throughout the week before storms sweep into the south and east on Thursday, bringing rainfall to much of the country after months of extreme heat.
Heatwave alerts remain in effect for six departments in the south-east on Monday but have been lifted elsewhere as cooler night-time temperatures help offset warm daytime conditions. The alerts, part of France's Vigilance météorologique system that uses a four-color code to indicate danger levels by department, are updated at least twice daily at 06:00 and 16:00.
This marks France's fifth heatwave alert of the season, following an intense stretch of hot weather that has repeatedly affected the country since May 2026. On June 20, France recorded its hottest day ever, with national temperature averages reaching 30°C across day and night, breaking the previous record of 29.4°C set in July 2019. July 2026 became France's hottest month on record and the third driest July for rainfall.
Although weather models do not currently predict another heatwave, state forecaster Météo-France considers it highly probable that coming months will be warmer than average. This could produce another heatwave in September or unseasonably warm temperature peaks in October. Under official criteria, a heatwave occurs when biometeorological indicators reach or exceed departmental thresholds for three consecutive days and nights, with thresholds varying by department based on local climate characteristics and health data.
Historic drought persists
Water restrictions continue across the country as France confronts a historic drought. Every single mainland department has now issued restrictions or warnings over tap water usage, marking the most widespread drought France has recorded since national monitoring began in 2013. As of early August, 67 of France's 101 departments were under the maximum crisis alert level, where water is allocated only for essential needs including healthcare, civil protection, drinking water, and sanitation.
France operates four escalating levels of drought restrictions: vigilance, alerte, alerte renforcée, and crise. At the crisis level, all non-essential water use is banned, including filling swimming pools and watering gardens. Underground water tables remain at below-average levels, with tens of thousands experiencing tap water supply cuts.
The drought appeared unusually early in 2026, with severe conditions emerging around a month earlier than usual despite spring rainfall levels being generally within the normal range. Dried-out soil fails to allow rainfall to penetrate, meaning water falling during storms is unlikely to filter down into aquifers used for tap water reserves. This means the forecast rainfall may provide little relief to the ongoing water crisis.
Monday August 17
Storms in the east will disrupt an otherwise quiet start to the week. Arriving early in the morning, they will run along the German border, inland to the Champagne area, and as far south as the Alps before diminishing in the evening. Rain and lightning are expected.
Elsewhere, cloudy but calm conditions are forecast, with daily highs remaining warm. Temperatures will reach 30°C in the north, 32°C along the Loire Valley, and 31°C in the south-west, alongside highs of 36°C along the Mediterranean.
Six departments maintain heightened orange alerts for heatwave conditions on Monday. These alerts will last overnight before being lifted on Tuesday morning at 06:00.
Tuesday August 18
The Azores anticyclone, a large semi-permanent high-pressure system typically found south of the Azores in the Atlantic Ocean, will arrive in the south-west of France and push across the country, reaching the Loire and Rhône Valleys. This weather system brings stable conditions, clear skies, and warm temperatures while blocking Atlantic depressions from reaching France.
The anticyclone will bring renewed warmer temperatures of 30°C and above across south-west and central France, potentially reaching up to 35°C in some areas. The south-east will maintain highs seen at the start of the week, around 35°C with peaks of 36°C. However, the warmer days are not accompanied by the intense hot winds or heat dome effect that caused previous heatwaves, and lower temperatures at night will help cool homes.
Heatwave alerts are not expected to be raised in these areas again as the anticyclone winds will only briefly cover these regions. Elsewhere, temperatures will drop slightly, with highs of 27°C in the north, but only around 22°C along the Normandy and Brittany coasts. It will be cloudy across the north and east, where the anticyclone does not reach.
Wednesday August 19
Similar conditions are forecast for Wednesday, with the exception of a weak passage of rain across the Loire Valley in the early morning. Areas in the north will remain cloudy and will see temperatures drop by a further 2°C or so, while the south remains sunny and warm.
Highs of 35°C are unlikely, but temperatures are set to reach 30°C across most of the south-west and Mediterranean.
Thursday August 20
The anticyclone will quickly move towards Italy on Wednesday evening, with powerful storms making their way into France from the east overnight in exchange. These will rapidly cross over the Alps, German border region, and Rhône Valley, bringing rain and lightning. They will continue towards the Atlantic coast, getting progressively weaker as the day progresses.
Stormy conditions are expected to last for much of the day in the east, bringing heavy rainfall. Météo-France is expected to implement alerts over the storms due to their forecasted severity.
Temperatures will drop across the south, with most areas of the country seeing highs of 22°C to 25°C. Despite the stormy conditions, the Mediterranean coast may still see temperatures above this, at 26°C to 27°C.
Friday August 21
Forecasts for Friday see rain covering essentially the entire country, with persistent drizzle in the north that becomes heavier further south. Storms will continue in the south-east, potentially leading to another day of intense rainfall before dying down in the evening.
Temperatures will drop once more, ranging between 20°C and 22°C across most areas but remaining at 25°C or above in the south-east under the storms.
Early forecasts for the weekend see rainy conditions persist across the country, with temperatures dropping by another 1°C or 2°C.
