Imagine walking through Lisbon’s sun-drenched streets as a wave of heat blankets the city. This June, Western Europe didn’t just feel hot—it shattered records. Data from the EU’s Copernicus Climate Change Service shows average temperatures soared above 40°C in Portugal and Spain, peaking at 46°C in some areas, marking the region’s hottest June ever.
On a global scale, June 2025 ranked as the third warmest June on record, trailing only 2024 and 2023. Europe is warming several times faster than the global average, propelling extreme heatwaves that pose serious risks to health, infrastructure and ecosystems.
Two heat domes—the first from June 17 to 22 and a second from June 30 to July 2—trapped sweltering air over the continent. The result? Exposed millions to extreme feels-like temperatures up to 48°C, intensifying heat stress and straining power grids as cooling demands soared.
Meanwhile, the western Mediterranean recorded a new daily sea surface temperature high of 27°C, five degrees above average. Warmer waters reduced nighttime cooling along coasts, boosted humidity and threatened marine life and coastal economies.
Key takeaways:
- Record highs: Average June temps surpassed previous records, with local peaks of 46°C.
- Global context: June 2025 was the planet’s third warmest, underscoring ongoing warming trends.
- Heatwaves & heat domes: Two major events fueled by stagnant air masses.
- Sea surface surge: Western Mediterranean waters hit 27°C, worsening nighttime heat.
- Adaptation strategies: Cities are exploring urban greening, cooling infrastructure and early warning systems to protect residents.
For young global citizens, entrepreneurs and changemakers tracking climate trends, Europe’s blistering summer offers both a stark warning and a call to action. As we prepare for hotter seasons ahead, innovative solutions—from heat-resilient architecture to community cooling hubs—will be crucial for resilience.
What steps will your city take to stay cool and safe as heatwaves become the new normal?
Reference(s):
Western Europe's hottest June ever continues global heat streak
cgtn.com
