Western Europe bakes under a heat dome as authorities warn of health risks

Record heat spreads across western Europe

Western Europe is baking under a stationary heat dome that has trapped hot air and humidity across the region, pushing France and the U.K. to record or near-record June temperatures and prompting urgent health warnings from authorities.

AP reported on Wednesday, June 24, 2026, that France had recorded its hottest-ever day for the second day in a row, while the U.K. logged its hottest June day on record. Officials in both countries warned that the conditions could be dangerous, especially for older adults, people with underlying health problems and anyone without reliable cooling.

The scale of the response reflects how quickly the early-summer heatwave has turned into a public-safety issue. Red alerts, school closures, transport disruptions and power problems have spread alongside the heat, affecting daily life in cities and smaller communities alike.

France and the U.K. hit record levels

In France, the national thermal indicator reached 30 C, and temperatures rose above 40 C in some places, including Paris, according to AP. Météo-France placed three-quarters of the country under a red heat alert starting at midday Thursday and lasting through the same time Friday, covering tens of millions of people.

AP also reported that heat-related equipment failure in Brittany knocked out power to tens of thousands of households, with about 68,000 households still affected on Wednesday. Major attractions such as the Eiffel Tower and the Louvre shortened visiting hours, and schools and transport schedules were disrupted.

In the U.K., the Met Office issued a red heat warning for much of central and southern England and Wales. AP said it was only the second red warning ever issued by U.K. authorities, after July 2022. The hottest reading reported was 36.1 C at Gosport in southern England.

Disruptions and health risks

The heat has already hit schools, rail networks and public venues. AP reported that more than 1,000 schools in England closed because of the heat, while many train services were canceled or delayed. Across France, Italy and Spain, authorities warned more than 100 million people to be extra vigilant about heat danger.

Public health officials are focusing on the people most at risk during extreme heat: older adults, young children, workers exposed outdoors and residents who cannot easily cool their homes. France has relatively limited air-conditioning coverage compared with the U.S., increasing exposure during prolonged hot spells.

AP also reported roughly 40 drownings in France over the prior week, with authorities warning people to be careful around unsupervised water such as rivers and lakes. Officials said the danger is not limited to direct heat illness, but also to secondary risks created when people seek relief in water or travel under stressful conditions.

Why the heat is so intense

AP's heat-dome explainer said the pattern is driven by a stationary high-pressure system that traps heat and humidity for several days. That setup can prevent cooler air from moving in and can allow temperatures to build day after day.

The broader climate context is also part of the story. AP said climate change is making heat domes and extreme heat events more frequent, more intense and more persistent, raising the odds that Europe sees similar episodes again.

Europe is especially vulnerable because much of its infrastructure was built for cooler summers. Homes, schools and transport systems can struggle when temperatures rise well beyond normal seasonal ranges, and health systems face extra pressure when the heat lasts for days.

What to watch next

Authorities will be watching whether France extends or widens its red heat alerts and whether the U.K. keeps its red warning in place as temperatures remain elevated. Further school closures, transport cancellations and power outages remain possible if the heat persists.

Officials are also tracking whether additional countries add higher-level alerts or new restrictions, and whether temperatures break more June records in France or the U.K. The most serious unanswered question is whether the event remains a disruption or turns into a higher casualty story, with heat-related illness and drowning figures still being monitored.