Parts of Ireland, France and Spain experienced their warmest June ever, according to data analysed by the EU’s climate service Copernicus.
Nearly all of Ireland was “much warmer than average”, but for areas of Dublin and the east coast, it was the warmest on record.
It was the same picture for much of England and Wales, France, Belgium, the Netherlands, Spain and Portugal.
By contrast, parts of eastern Europe and Scandinavia recorded their coolest ever June.
Two major heat waves during mid-June and at the end of the month were “linked to persistent high-pressure systems, often referred to as ‘heat domes’, which trapped warm air and led to prolonged hot, sunny, and dry weather.
The situation also contributed to increased ozone air pollution and heightened risk of wildfire weather”, Copernicus said.
Sea temperatures were also higher by around 1 degree around Ireland, and by as much as five degrees warmer in parts of the Mediterranean.
Warmer sea temperatures causes “heat stress for marine biodiversity and impacts for ocean industries such as fisheries and aquaculture by reducing water oxygen levels”, Copernicus warned.
Globally, June 2025 was 1.30°C above pre-industrial averages. It was only the third month in the last two years which did not breach 1.5°C.
Copernicus is part of the European Union’s Space programme monitoring climate patterns.