Europe moves into early heat emergency footing after record May temperatures

Italy issued a red alert for Rome on Thursday as France, Portugal and the UK reported record May heat, according to France 24 and The Guardian. The heat arrived unusually early, with a high-pressure “heat dome” pushing temperatures across parts of Europe far above seasonal norms.

The records were sharp. The Guardian reported that the UK reached 35.1C at Kew Gardens in London on Tuesday, breaking a May record that had been set only the day before at 34.8C. The previous May maximum was 32.8C, first recorded in 1922 and matched in 1944. Ireland also broke its May maximum, with 28.8C recorded at Killarney and Clonmel.

France recorded its hottest May days on Monday and Tuesday, with temperatures reaching 36C, according to The Guardian. Mundoamerica reported that 17 French departments activated orange alerts for the first time in May, with a peak of 39C in the south of the country. Portugal’s central town of Mora reached 40.3C on Wednesday, France 24 reported, above the previous May record of 40C from 2001.

The early emergency footing is visible in public-health measures. Italy warned people in Rome and four northern cities to stay out of the sun. France was preparing an emergency meeting to assess the inter-ministerial response, Mundoamerica reported, with possible school closures and sports-event cancellations among the measures under consideration.

The human effects were already being counted. France 24 reported several deaths in Britain and France, mostly drowning accidents linked by authorities to the heat, and said Portugal’s Health Minister Ana Paula Martins reported a spike in hospitalisations. Mundoamerica said the heat dome had so far claimed seven lives in France, five by drowning, and four in the UK. The Guardian cited a French government spokesperson saying seven deaths were linked directly or indirectly to the heat.

The mechanism is a public-health transmission chain. Extreme heat first changes behaviour: people seek water, shade, cooling and altered work or travel patterns. If exposure continues, pressure moves into ambulances, hospitals, schools, care homes, outdoor work, transport systems and family routines. The earlier the heat arrives, the less time institutions have to move from seasonal planning into active response.

Europe has built some of this response through experience. Phys.org reported that the 2003 Western European heatwave led to an estimated 70,000 additional deaths across 16 countries, and that several countries later created heat-alert systems, including France’s heatwave plan. It also cited more than 61,000 deaths attributable to heat during summer 2022 across 35 European countries.

The broader climate context is also part of the official warning. Phys.org said Europe has experienced the fastest warming of any continent since 1990, citing US National Oceanic and Atmospheric Administration data. Mundoamerica quoted Simon Stiell of the UN Framework Convention on Climate Change calling the heatwave a “brutal reminder” of the climate crisis and saying climate change makes heatwaves more frequent and extreme.

What remains uncertain is how long the current heatwave will last and how many deaths or hospitalisations will ultimately be attributed to it. France 24 reported Portugal’s meteorological agency warning there was a high likelihood the heatwave would last into the beginning of June, but the supplied evidence does not provide final health totals or full country-by-country response plans.

The cleanest implication is that heat response is becoming routine governance before summer even begins. Alerts, school decisions, hospital capacity, event cancellations and public warnings are no longer exceptional measures reserved for August; they are becoming part of how European governments manage basic public safety in a hotter climate.