France Places 72 Departments on Red Heat Alert

Nighttime storms may bring relief but create new dangers.

Paris, June 2026

France placed 72 departments under the highest red heat alert as an exceptional June heatwave pushed temperatures above 40 degrees Celsius across large parts of the country. Another 14 departments remained under orange alert, leaving most of metropolitan France exposed to conditions considered dangerous for the general population. Authorities warned that the extreme heat would continue through Thursday before violent nighttime storms began weakening the hot air mass in western regions. The expected transition may lower temperatures, but it also introduces risks from hail, intense rainfall, strong winds and flash flooding.

The heatwave has broken records across the country. France registered its highest national average temperature for any day since measurements began, while individual stations reported exceptional values from Brittany to the southwest and central regions. Cazaux reached 43.6 degrees Celsius, Nantes recorded 42.2 and Paris exceeded 40 degrees. These temperatures would be severe in midsummer and are particularly unusual during June.

Nighttime conditions have provided little recovery. The overnight period between Wednesday and Thursday was described as the hottest recorded nationally since systematic records began in 1947. In Paris, minimum temperatures remained close to 27 degrees Celsius, preventing buildings and human bodies from releasing accumulated heat. Warm nights are especially dangerous because prolonged exposure increases cardiovascular stress, dehydration and exhaustion even among people who appear healthy.

The red-alert system indicates that the heat poses a threat beyond traditionally vulnerable groups. Older adults, infants, pregnant women and people with chronic illnesses remain at greatest risk, but authorities also warned active adults between 50 and 70 not to continue their normal routines without modification. Health officials said many serious cases involve people who underestimate the conditions because they do not consider themselves fragile. Emergency room visits for heat-related illness have increased sharply across the country.

Hospitals have reported rising cases of dehydration, hyperthermia, cardiovascular complications and low sodium levels. Emergency medical calls increased between 15 and 20 percent in several regions, while some urban areas recorded much greater surges. Paris registered an unusual number of cardiac arrests within a single day. The health system remains operational, but authorities have activated contingency measures to free hospital capacity and reinforce emergency services.

Schools have become another focal point of the crisis. Thousands of institutions were closed, partially closed or placed under modified schedules because classrooms reached temperatures approaching 40 degrees Celsius. Teachers’ unions accused the government of failing to prepare school buildings for increasingly frequent extreme heat. Students taking national examinations faced additional measures intended to provide water, ventilation and access to cooler rooms.

The heat has also altered work, transport and public life. Outdoor labor has become dangerous during the hottest hours, while employees in warehouses, kitchens and poorly ventilated buildings face similar risks indoors. Cultural sites have reduced opening hours, public events have been modified and rail services have operated under heat-related precautions. Cities have opened parks, cooling centers and additional public water points for residents unable to maintain safe temperatures at home.

The number of drowning deaths has risen as people seek relief in rivers, lakes and unsupervised swimming areas. French authorities reported dozens of fatalities since the heatwave began, including adults who entered dangerous water and children involved in separate incidents. Officials urged the public to use supervised facilities and avoid unfamiliar waterways. Heat can impair judgment and physical capacity even among experienced swimmers.

The country’s electricity system has also faced pressure. Nuclear plants use river water to cool their reactors, but prolonged heat raises the temperature of those waterways. Energy provider EDF temporarily shut down reactors at facilities including Nogent-sur-Seine and Bugey to avoid releasing additional heated water into already stressed ecosystems. The precaution demonstrates how extreme temperatures can affect infrastructure even when electricity demand rises because of cooling needs.

Agriculture is expected to suffer losses across multiple sectors. High temperatures can reduce cereal yields, damage fruit and vegetables, increase water requirements and cause mortality among poultry and other livestock. Farmers must also adjust working hours to protect employees and animals. Significant production losses could eventually contribute to higher food prices.

Meteorologists expect the atmospheric pattern responsible for the heat to begin weakening as cooler Atlantic air moves toward the country. Western and northwestern regions should experience the first decline in temperatures, followed gradually by central and eastern areas. Much of France could return closer to seasonal levels by the beginning of the following week. Southern and southeastern regions may remain hot for longer.

The arrival of cooler air will not be calm. When it collides with the hot and humid air trapped over France, severe thunderstorms may develop from Thursday night into Friday. Forecasts include heavy rain over short periods, lightning, hail and powerful wind gusts. Urban areas and dry ground may be unable to absorb sudden rainfall, increasing the possibility of localized flooding.

Storms also create risks for trees, electricity networks, roads and outdoor events. Residents have been advised to secure loose objects, avoid exposed areas and postpone unnecessary travel during the most intense periods. Drivers should not enter flooded roads, even when the water appears shallow. Emergency services may need to respond simultaneously to heat-related medical incidents and storm damage.

The heatwave has revived memories of the 2003 disaster, when approximately 15,000 excess deaths were recorded in France. The country has since developed stronger warning systems, public health plans and support networks for isolated residents. Yet the current event is exposing persistent weaknesses in schools, housing, workplaces and urban planning. Many buildings were designed for colder historical conditions and retain heat during prolonged summer extremes.

Scientists emphasize that climate change is increasing the frequency, duration and intensity of European heatwaves. France is not experiencing an isolated meteorological anomaly but part of a broader pattern affecting western and central Europe. Temperature records have also fallen in Britain and Switzerland, while Spain, Italy and Germany face serious health and infrastructure impacts. The continent is warming faster than the global average.

The approaching storms may end the most intense phase of the emergency, but they will not erase its consequences. Hospitals, schools, farmers, energy providers and local governments will continue managing the effects after temperatures decline. The experience reinforces the need for cooling infrastructure, adapted work rules, climate-resilient buildings and stronger protection for vulnerable populations.

France now faces a difficult transition from extreme heat to potentially destructive storms. The immediate priority is to prevent further deaths while maintaining essential services through rapidly changing conditions. Relief is approaching, but the atmosphere is replacing one hazard with another.

El clima cambia; la prevención también debe hacerlo. / The climate changes; prevention must change too.