Record Heatwave in Basque Country: Irun, Mutriku & Zumaia Hit 28°C+ Overnight

Spain’s northern Basque Country is experiencing an unprecedented heatwave, with coastal towns like Irun, Mutriku, and Zumaia recording nighttime temperatures that defy seasonal norms. While most of the Iberian Peninsula grapples with late-May warmth, Gipuzkoa’s Basque coast is enduring a phenomenon meteorologists describe as “tórrida” — a term borrowed from Spanish to evoke extreme, suffocating heat. Official forecasts from Spain’s national meteorological agency, AEMET, confirm that minimum temperatures in these coastal municipalities have soared to levels typically associated with summer afternoons, not overnight lows.

The situation underscores a growing climate pattern: coastal regions in northern Spain, historically known for milder summers, are now experiencing more frequent and intense heat spikes. While inland areas often see temperatures drop below 20°C at night this time of year, Gipuzkoa’s coastal strip has defied expectations, with some locations failing to dip below 25°C even during the early morning hours. This inversion of day-night temperature cycles has significant implications for agriculture, tourism, and public health in a region accustomed to maritime moderation.

According to AEMET’s latest municipal forecasts for Irun — one of the hardest-hit areas — the region’s overnight lows have consistently hovered around 28°C in recent days, a figure that would be considered exceptional even for July. The agency’s 7-day prediction for Irun shows a persistent pattern: maximum temperatures fluctuating between 32°C and 34°C by day, while nighttime minimums remain stubbornly above 25°C. Similar conditions are reported in neighboring Zumaia and Mutriku, where residents have taken to social media to describe the phenomenon as “a sauna that never turns off.”

Why Are Coastal Areas Heating Up More Than Inland Regions?

Climatologists point to several factors contributing to this anomaly. First, the Atlantic Ocean’s surface temperatures have been running warmer than average this year, reducing the usual cooling effect that maritime breezes provide. Second, persistent high-pressure systems over the Bay of Biscay are trapping heat near the coast, preventing the usual nighttime temperature drops. Finally, urbanization along the Basque coast has created “heat islands” where asphalt and concrete absorb and re-radiate solar energy long after sunset.

Dr. María José Rodríguez, a climate scientist at the Basque Government’s environmental agency, noted in a recent interview with EITB that “these nighttime heat records are becoming the new normal for our coastlines.” She cautioned that such conditions exacerbate health risks, particularly for vulnerable populations like the elderly and those with respiratory conditions. The Basque Health Department has issued advisories urging residents to stay hydrated, avoid outdoor activities during peak heat hours, and monitor symptoms of heat exhaustion.

How Are Local Authorities Responding?

Gipuzkoa’s provincial government has activated its heatwave response protocol, which includes:

• Opening emergency cooling centers in municipal buildings
• Increasing water truck deliveries to public spaces
• Coordinating with local hospitals to prepare for potential heat-related cases

The Basque Country’s meteorological service has also enhanced its forecasting models to provide more granular alerts for coastal communities. “We’re seeing a 30% increase in nighttime heatwave alerts for coastal zones compared to just five years ago,” said AEMET’s regional director in a statement. The agency has deployed additional mobile monitoring units along the Gipuzkoa coast to track real-time temperature variations.

What In other words for Spain’s Energy Grid

While the heatwave poses immediate health risks, it also strains regional infrastructure. Air conditioning demand has surged by nearly 40% in Gipuzkoa’s urban centers, according to preliminary data from the Basque Energy Agency. This comes at a time when Spain’s national grid operator, Red Eléctrica de España, has issued warnings about potential capacity constraints during extended heatwaves. The Basque government is working with renewable energy providers to ensure stable power supply while minimizing carbon emissions.

Tourism operators in the region report mixed effects: while beachgoers are flocking to the unusually warm coast, some cultural sites have seen reduced visitor numbers due to the oppressive daytime heat. The Basque Tourism Board has adjusted its promotional campaigns to highlight evening activities and indoor attractions during the peak heat periods.

Looking Ahead: Will This Become the New Normal?

Climate projections for the region suggest that such extreme nighttime heat events will become more frequent. A 2023 report by the Intergovernmental Panel on Climate Change indicated that the Mediterranean and Atlantic coasts of Spain could see a 2-3°C increase in average nighttime temperatures by 2050 under current emission trajectories. For Gipuzkoa’s coastal communities, this means preparing for summers where 25°C at midnight becomes the rule rather than the exception.

AEMET’s long-term climate models show that by 2040, the current record nighttime temperatures for Irun (28.7°C) could become the new average minimum during heatwaves. This shift would require significant adaptations in urban planning, agricultural practices, and public health strategies.

Key Takeaways

• Unprecedented coastal heat: Gipuzkoa’s Basque coast is experiencing nighttime temperatures above 25°C, defying seasonal norms and creating a “tórrida” (extreme heat) environment typically associated with desert climates.
• Climate drivers: Warmer Atlantic surface temperatures, high-pressure systems, and urban heat islands are the primary factors behind this phenomenon.
• Health risks: Authorities have issued advisories warning of increased heat exhaustion risks, particularly for vulnerable populations.
• Infrastructure strain: Energy demand has surged by nearly 40% in affected areas, testing regional power grids.
• Long-term outlook: Climate models suggest these extreme nighttime heat events will become more frequent, requiring adaptive measures in urban planning and public services.

The next official update from AEMET’s Gipuzkoa regional office is scheduled for May 27, 2026, at 14:00 CET, where they will provide an extended forecast and potential heatwave advisories for the coming week. Residents are advised to monitor AEMET’s alert system and local municipal channels for real-time updates.

Have you experienced these extreme nighttime temperatures in Gipuzkoa? Share your observations and tips for staying cool in the comments below — your insights could help others prepare for this new climate reality.