Western Europe just had its hottest summer on record – what happened in 2026?

Summer 2026 has entered the climate record books. According to the Copernicus Climate Change Service (C3S), western Europe experienced its warmest summer on record in the ERA5 dataset. The average surface air temperature across the defined western European region reached 21.69°C, which was 2.54°C above the 1991–2020 average.

The result is significant because it was not driven by one hot afternoon or one isolated heatwave. It describes the average conditions across June, July and August over a broad region stretching from the western Mediterranean into parts of central and northern western Europe.

France and northeastern Spain were among the strongest hotspots

Copernicus found the largest seasonal anomalies mainly across France and northeastern Spain, where temperatures were locally around 4 to 5°C above the 1991–2020 summer average. Record seasonal warmth also affected large areas of England, Wales and Belgium, as well as much of France, Spain, Italy, Switzerland and Austria.

For Europe as a whole, summer 2026 ranked third warmest in ERA5, at 1.17°C above the 1991–2020 average. That difference matters: the continent did not warm uniformly. Western Europe was the standout region.

🌡️Europe heat in numbers

• Western Europe summer average: 21.69°C.
• Anomaly versus 1991–2020: +2.54°C.
• Europe as a whole: third-warmest summer in ERA5, at +1.17°C.
• August 2026 was the warmest August globally in ERA5 at 16.96°C.
• Every western European summer since 2015 has been warmer than the 1991–2020 average.

Why the 2003 comparison stands out

The previous western European summer record was set in 2003, a year remembered for a devastating heatwave. At that time, 2003 stood far above surrounding summers. The 2026 record comes in a different background climate: Copernicus notes that every summer since 2015 has been warmer than the 1991–2020 average, with 2022 already approaching the 2003 level.

That does not mean every summer will be hotter than the one before it. Weather patterns still produce large year-to-year variations. But the baseline on which those patterns act has shifted upward.

Warm seas added another important signal

August 2026 also brought record sea-surface temperatures for the month across the extra-polar global ocean. Around Europe, record-high August sea temperatures were observed along parts of the Atlantic coast and in the western Mediterranean, with widespread strong to severe marine heatwave conditions.

Warm seas matter for more than swimmers. They influence evaporation, coastal night-time temperatures and the amount of heat stored in the climate system. In the Mediterranean, unusually warm water can also provide extra moisture when autumn storm systems arrive, although any individual heavy-rain event still depends on the atmospheric setup.

A record season does not describe every local experience

Climate statistics are averages over large areas and long periods. A town that had several cool, rainy weeks may not feel as if it experienced a record summer. Likewise, one exceptionally hot location does not define a continental record. The value of the ERA5 analysis is that it combines the full season and a broad region in a consistent dataset.

For western Europe, the 2026 result is therefore a clear marker: the region’s summer climate reached a new high in the modern reanalysis record, with heat affecting a wide area rather than one isolated country.