Spain heat wave kills over 1,000 in second-hottest June ever

Spain heat wave kills over 1,000 in second-hottest June ever

Spain recorded at least 1,028 heat-related deaths in June 2026, making it the deadliest June for such fatalities since records began in 2015, officials announced Wednesday. The toll is more than double the 407 deaths recorded in June 2025.

The spike in fatalities began around June 21, coinciding with a record-breaking heat wave that pushed temperatures above 40 degrees Celsius. According to the Carlos III Health Institute and the Health Ministry's daily mortality monitoring system (MoMo), the vast majority of victims were elderly. Specifically, 1,022 of the deaths occurred in people aged 65 or older, with 720 of those individuals aged 85 and above. Only one death was recorded in a person under 15.

High death tolls were concentrated in Spain's northern and Mediterranean regions, including the Basque Country (147 deaths) and Catalonia (218 deaths). Officials noted that these communities are typically less acclimatized to prolonged extreme heat. In northern regions such as Asturias, Cantabria, La Rioja, and Galicia, the heat wave was described by the national weather agency Aemet as exceptional due to its intensity, duration, and persistence.

Record-Breaking Temperatures

June 2026 stands as Spain's second-warmest June since records began in 1961, surpassed only by June 2025. Aemet reported that average temperatures last month were 3.2 degrees Celsius above the 1991-2020 average. The agency also noted that the 13 warmest Junes since 1961 have all occurred in the 21st century.

The heat wave's peak on June 23 exposed 35.7 million people — roughly 73% of the Spanish population — to health risks, with 38% of that group facing high risk. Local weather stations recorded 165 maximum temperature records (20 all-time) and 225 highest minimum temperature records (45 all-time) between June 1 and 30. In El Granado, Huelva, thermometers hit 46°C, setting a new national record for June and breaking a 1965 record from Seville.

This follows a broader trend of warming; Aemet reported that the first half of 2026 was the warmest for Spain since records began, with temperatures 1.6 degrees Celsius above normal. The agency stated that the seven warmest first semesters have occurred within the last 10 years.

Continental Impact and Causes

The Spanish crisis was part of a severe heat wave across Europe. The World Health Organization (WHO) attributed more than 1,300 additional deaths across the continent to the event. In France, around 1,000 excess deaths were reported from last week's extreme temperatures, and the country experienced its highest-ever nighttime temperatures.

All-time temperature records were broken in several nations, including Switzerland, the U.K., Poland, Germany, Slovakia, Hungary, and the Czech Republic. Meteorologists attribute the surge to a mass of hot air moving north from the Sahara, pushed by a high-pressure system known as the African anticyclone. This system created a heat dome that trapped hot air over Central and Western Europe.

The World Weather Attribution group found that this heat wave would have been virtually impossible without human-induced climate change. Experts say climate change made this year's record heat up to 4 degrees Celsius hotter. Researchers noted that nighttime heat in Europe is now about 100 times more likely than it was during the 2003 heat wave.

Synergistic Health Risks

Beyond direct heatstroke, which causes only a few dozen deaths annually, most fatalities occur in vulnerable people suffering cumulative effects. Julio Díaz of the Carlos III Health Institute stated that approximately 18% of the increase in mortality during Spanish heat waves is driven by pollution.

High temperatures and traffic pollution can interact to form ozone, creating a synergistic effect where heat and pollutants, such as ozone and fine particulate matter, increase deaths more than either would separately. In response, Spain's Ministry for the Ecological Transition is developing an integrated health plan on air pollution and heatwaves that includes studying Saharan dust and biomass burning to better anticipate risks.

Looking Ahead

The respite from the heat may be short. Aemet forecasts another potential heat wave starting this weekend, driven by additional hot air masses. Meanwhile, Portugal issued red heat warnings for Lisbon and Setubal for Thursday, with highs of 40 Celsius forecast in the capital. Most of Portugal remains under an orange heat alert, with high pressure expected to spread east and north toward Spain, France, and Italy in the ensuing days.