Sweltering in the Old World: The European heat wave of 2003.
A horrifying heat wave in Europe in 2003 killed as many people as the Hiroshima bomb.
During the last month (June 2026), headlines and social media were full of talk about the unusual and extreme heat wave in Europe. I have friends in Europe who I talk to on a more or less daily basis, and their complaints about the heat and humidity were hard to dismiss. As it turned out a group of my middle school students went on a trip to Europe, particularly France—I was not a part of it—and they had the unfortunate serendipity to have to experience their first sights of landmarks in Paris or Lyon in uncomfortable, sticky heat. We’re still taking stock of the impact of the 2026 heat dome event, but it obviously harks back to another heat-related disaster that raked the continent more than 20 years ago which is worth examining for all the ominous lessons it held for the future.
On August 10, 2003, a thermometer in Faversham, Kent, in England, registered the highest temperature ever recorded in the United Kingdom up to that time: 101.3° F (38.5° C). That record stood for more than two decades, only having been broken by a reading of 104.5° F (40.3° C) clocked at Coningsby in July 2022. The tenth of August 2003 was the worst day of a heat wave that was remembered across Europe as the worst the continent had experienced in living memory. For two weeks at the beginning of August the punishment continued unrelenting. Pavements and ancient cobblestone streets shimmered with heat from Rome to Scotland. In the midst of drought, great European rivers like the Loire and the Danube were lower in their banks than many had ever seen. But it was more than just a stretch of uncomfortable weather where it was hard to sleep or get any meaningful relief. The terrible heat wave was also very deadly. Across the continent as many as 70,000 people died—the same number of people killed by the Hiroshima bomb in 1945. Just imagine that: a heat wave as deadly as a nuclear strike.
