Spain's Extreme Heatwaves
Climate Crisis Fuels More Frequent and Intense Heatwaves Across Spain This Summer
Spain has already recorded two major heat waves since mid-May, and it is only early July. Temperatures hit 45°C in several parts of the country, and nighttime lows stayed above 32°C in some areas — offering no relief after dark. Informacion.es reports that the extreme heat arrived earlier than usual this year, a sign that the climate crisis is reshaping the summer calendar.
The big question now: how many more heat waves will Spain face before summer ends? Experts warn that climate change makes it harder to predict — and easier for records to break. The rules of the game have changed.
Two Heat Waves Down, Summer Barely Started
The first heat wave of 2025 struck in mid-May — unusually early by any historical measure. Spain barely had time to recover before a second wave hit, pushing thermometers to 45°C in multiple locations. According to Diario de Mallorca, some areas also recorded minimums above 32°C, meaning the heat never let up at night.
Nights above 25°C are called "tropical nights." Nights above 30°C are sometimes called "equatorial nights." When those become common, the human body gets no chance to recover from the daytime heat. That raises the risk of heat-related illness and death, especially for the elderly and the very young.
Climate Crisis Makes Predicting Heat Waves Much Harder
In the past, Spain typically saw one or two heat waves per summer, mostly in July and August. Now, according to El Correo Gallego, the season starts earlier, lasts longer, and individual episodes are more intense. The climate crisis is not just making summers hotter — it is making them more unpredictable.
Meteorologists say the atmospheric patterns that once kept extreme heat in check are weakening. Hotter air masses from Africa reach Spain more often and stay longer. Diario Córdoba notes that what was once a rare extreme event is becoming a regular summer feature across the Iberian Peninsula.
How Many More Waves Could Hit Before September?
No forecast can say exactly how many heat waves remain this summer. But scientists say the probability of more episodes is high. Historical data shows that once a summer begins with early and intense heat, further waves are more likely — not less. La Provincia reports that Spain could face between two and four additional heat waves before September.
The months of July and August are traditionally the peak risk window. With two waves already recorded before July 4, the baseline is already above average for any summer on record. El Periódico de Aragón points out that each additional wave compounds the stress on public health systems, energy grids, and agriculture.
Health and Infrastructure Face Growing Strain
Heat waves kill. In the summer of 2022, Spain recorded over 4,600 heat-related deaths, one of the highest tolls in Europe. Authorities are watching this summer closely. La Opinión de Málaga reports that hospitals and emergency services are already on heightened alert following the first two episodes.
Energy demand also spikes during heat waves as air conditioning use surges across the country. LNE notes that Spain's power grid operator has had to manage sharp demand increases during each of the two waves so far. If more waves follow, the pressure on both the health system and the electricity network will only grow.
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