Spain records over 1,000 heat-related deaths during second-hottest June
Official data confirms Spain’s second-hottest June resulted in 1,029 heat-attributable deaths, driven by an intense five-day heatwave and an African anticyclone.
Spain has concluded its second-hottest June since records began, with official data linking the extreme temperatures to over 1,000 excess deaths. The national health monitoring system, MoMo, reported 1,029 heat-attributable fatalities for the month, marking the highest June death toll since the system began tracking such data in 2015. This figure represents more than double the 407 heat-related deaths recorded in June 2025.
The state meteorological agency, AEMET, classified the month as "extremely warm," with average temperatures across mainland Spain reaching 23.2 degrees Celsius. This was 3.2 degrees above the average for the 1991–2020 reference period. The agency noted that the only hotter June in its historical series, which dates back to 1961, was the previous year.
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A persistent trend
The heat was driven by a severe five-day heatwave that peaked between 22 and 24 June, impacting the mainland and the Balearic Islands. During this interval, 35.7 million people—approximately 73% of the Spanish population—were exposed to health risks. AEMET spokesperson Ruben del Campo stated that the intensity, duration, and geographical reach of the heat were exceptional, particularly in the northern half of the country, where numerous all-time temperature records were surpassed.
Meteorologists attribute the persistent heat to an "African anticyclone," a high-pressure system that created a "heat dome" over Western and Central Europe, trapping Saharan air. Research from the World Weather Attribution group suggests that such a heatwave in June would have been "virtually impossible" without the influence of human-induced climate change. AEMET data confirms that heatwaves are arriving earlier and occurring more frequently: while only two heatwaves were recorded in June between 1975 and 2000, that number grew to ten between 2000 and 2025.
Broader health implications
The MoMo monitoring system, overseen by the Carlos III Health Institute, calculates excess mortality by comparing observed deaths against expected figures for a given period, rather than relying solely on death certificates that explicitly state heatstroke. Experts caution that the true impact of heat often manifests through the exacerbation of pre-existing conditions, including cardiovascular, respiratory, and circulatory stress.
There is also growing concern regarding the "synergistic effect" of heat and air pollution. Julio Díaz, a researcher at the Carlos III Health Institute, estimates that roughly 18% of the increase in mortality during heatwaves is driven by the interaction between rising temperatures and pollutants such as ozone, which forms more readily in hot conditions. The Spanish Ministry for the Ecological Transition is now developing an integrated health plan to account for these joint risks, with particular focus on adjusting temperature thresholds to reflect local pollution levels.
Comparison of Recent June Heat Impacts
| Indicator | June 2025 | June 2026 |
|---|---|---|
| Average Temperature | 23.6°C | 23.2°C |
| Attributable Deaths | 407 | 1,029 |
What to watch next
- Health alerts: With the heat-related death toll rising, authorities are emphasizing that vulnerable populations, particularly those over 75, require consistent monitoring throughout the summer, not just during peak heat events.
- Regional spread: Neighboring Portugal has already issued red heat warnings for the Lisbon and Setubal regions as high-pressure systems continue to move across the peninsula.
- Policy shift: The Ministry for the Ecological Transition is expected to finalize plans for integrated health alerts that account for both extreme heat and traffic-related pollution, potentially including new traffic restrictions during heatwaves.
- Data updates: While the MoMo figures are provisional, officials note that the total may rise further as late-registered death certificates are incorporated into the system.
The record-breaking heat is not isolated to Spain; the World Health Organization has identified more than 1,300 additional heat-related deaths across Europe. As climate patterns shift, researchers are increasingly focused on the intersection of long-term global warming and the immediate, day-to-day management of health risks during the early summer season.
