Europe's Fifth Heatwave of Summer 2026: A Continent in Crisis

Europe's summer of 2026 has been defined by five successive heatwaves since May, with the latest (fifth) wave in August intensifying a continent-wide crisis. Scientists attribute this extreme summer primarily to fossil fuel-driven climate change . Here are the key impacts and record-breaking events.

Record-Breaking Temperatures and Scale

The fifth heatwave, driven by a heat dome, pushed temperatures past 35°C across vast areas. Over 135 million people faced temperatures above 35°C on a single day, and nearly 340 million Europeans — roughly three out of five — experienced temperatures exceeding 30°C . The UK recorded its hottest day of 2026 on August 13, reaching 38.1°C at Kew Gardens . Britain is on course for its hottest summer on record, already recording four days above 36°C .

Temperature records were broken in at least 18 countries across the summer, including Austria, Belgium, Czechia, Denmark, France, Germany, Hungary, Ireland, Italy, the Netherlands, Poland, Romania, Slovakia, Slovenia, Spain, Switzerland, and the UK . Poland set an all-time national record of 40.5°C in June . Western Europe experienced its warmest June–July period on record, according to the EU's Copernicus Climate Change Service .

Britain's Record Wildfire Season

The UK has experienced a historic wildfire season. As of August 10, over 23,359 hectares had been burnt, with 72 fires larger than 30 hectares recorded . Wildfires in England and Wales hit record levels, with fire chiefs warning that rescue services were struggling to keep up — fires raced from tinder-dry fields to engulf houses in the West Midlands on the hottest day of the year . The National Fire Chiefs Council reported that July was the busiest month on record for wildfires, with services responding to 966 wildfires this year, including 458 in July alone .

Severe Drought and Crippled Riverways

The EU's Joint Research Centre reported that Europe's four major rivers — the Loire, Po, Rhine, and Danube — were pushed to record low levels in August . The Rhine fell to record lows in Cologne, Germany, and Lobith, Netherlands — lower than at any point since records began . Levels were so low that large stretches risked becoming unnavigable for cargo barges, with vessels loading as little as a fifth of normal capacity at the key chokepoint of Kaub . The Danube also hit historic lows, with serious consequences for energy and transport across Central Europe . A cruise ship, the Viking Ullur, ran aground on a sandbank in the Danube, forcing the evacuation of 186 passengers .

Nuclear Power and Energy Disruptions

Hungary came close to a forced shutdown of its only nuclear power plant (Paks) because the Danube's low water levels threatened reactor cooling . The plant was subsequently operating at only 80% of its capacity . Extremely low water levels on both the Rhine and Danube disrupted energy generation, freight transport, and industrial supply chains — barge traffic for chemicals, oil products, and other goods was significantly curtailed . For the first time in their history, Hungary and Romania had to shut down atomic reactors normally cooled by the Danube .

Grain Harvests

Widespread drought compounded by recurrent heatwaves severely damaged agricultural output across the continent. The EU's Joint Research Centre noted that prolonged poor rainfall and severe heatwaves since May had worsened drought conditions across Europe throughout the growing season . The British government imposed irrigation restrictions on farmers and introduced a hosepipe ban in some regions, with more than 27 million people living under water-use restrictions .

Excess Deaths

EuroMOMO data (backed by the European Centre for Disease Prevention and Control) showed more than 10,000 excess deaths across Western Europe during the late June heatwave alone . Over 9,000 of those were among people aged 65 and above . In Britain, over 2,700 people in England and Wales were estimated to have died from heat-related causes in recent heatwaves . France reported about 1,000 excess deaths in the June heatwave alone . The WHO's director-general noted over 1,300 excess deaths linked to high temperatures had been recorded since June 21 . A study by Imperial College London found that human-caused climate change nearly tripled heat-related deaths during the early-summer heatwave in 12 European cities, accounting for approximately 1,500 additional deaths . The UK Met Office estimated climate change was responsible for 42% of heat-related deaths in England and Wales .

Scientific Attribution

The 2026 heatwaves were unequivocally linked to human-induced climate change driven by fossil fuel burning . Scientists warned that Europe is warming faster than any other continent . Attribution research found that climate change intensified the heatwaves and "nearly tripled" heat-related deaths compared to a world without human-caused warming . A World Weather Attribution group of scientists stated that the late-June heatwave would have been "virtually impossible" without human-caused climate change .