In late June 2026, a severe heatwave swept across Europe, setting new temperature records in multiple countries. Germany recorded its hottest June day on record — 41.3°C near Saarbrücken on 27 June — while France hit its all-time hottest day ever, Britain reached a new June high of 36.1°C, and Spain experienced its first official heatwave of the year, according to Reuters. Italy and Switzerland also recorded extreme temperatures during the same period. On 30 June, the average temperature across western Europe hit 24.9°C, a new June record, according to Copernicus Climate Change Service.

The heat caused serious harm. Power cuts left thousands of people in France without electricity while the heat was at its worst. Buses and trains were disrupted across the continent. Schools and tourist attractions closed as temperatures exceeded 40°C in multiple countries, Reuters reported on 24 June. About 20 people drowned in France during the heatwave — experts say this happens when people try to cool down by swimming or entering water. Companies across the continent changed their schedules, starting work before dawn to avoid the worst heat, and some used cooling equipment to protect workers, according to a Reuters report on 23 June.

Why the Heat Arrived

This heatwave did not come out of nowhere. May 2026 was already one of the warmest Mays on record in Europe, at 0.60°C above the normal temperature, Copernicus reported. This meant Europe was already unusually hot when summer officially began. Globally, May 2026 was the second-warmest May ever recorded. Before the June heatwave, April 2026 had seen some of the warmest ocean temperatures on record. Warm ocean water acts like a heater for the air above it, helping to create and strengthen the hot-air systems that sit over land, Copernicus noted.

Across much of Europe, temperatures during the June heat reached or exceeded 40°C — a threshold that is far more common now than it was before the 2000s. Even Ireland, which is normally protected by its Atlantic Ocean location from extreme continental heat, has been hitting temperature records. Summer 2025 was the warmest summer on record there over a 125-year measurement period, according to Met Éireann's climate centre. The fact that even Ireland's normally mild climate is setting records shows how widespread the heat problem has become.

What Happens Next

For people managing electricity systems, emergency services, and hospitals, the question now is whether the power grids and health systems — built for cooler climates — can handle the heat ahead. The fact that France lost power in June, before the even hotter months of July and August, shows the systems are already under strain.

Governments across Europe were already discussing new rules for workers during heat, Reuters reported. This massive heatwave covering Spain, France, Britain, the Alps, and Central Europe will push those discussions faster. Cities, businesses, and insurance companies are now realizing they need new heat safety plans.

The record of 41.3°C in Germany is the number people are talking about. But what matters more is the full picture: many countries set temperature records in the same month, the average temperature across western Europe hit a new high, and the heat is moving east while summer is still young. This is what emergency planners and grid managers will be watching closely as June ends and temperatures could get even hotter.