epa13058190 People sunbathe and swim at London Fields Lido outdoor swimming pool as the UK is set to experience its hottest June day on record during a heatwave in London, Britain, 23 June 2026. The Met Office has issued an amber warning for 23 June and its second-ever red warning for extreme heat for 24 June, with temperatures expected to reach at least 39...

epa13058173 A couple walks with an umbrella in downtown Zagreb, Croatia, 23 June 2026. Reports state that in recent days Croatia has recorded high temperatures exceeding 35 degrees Celsius. Europe is bracing for a heatwave as forecasters predict temperatures could rise above 40 degrees Celsius. EPA/ANTONIO BAT

epa13058168 People hydrate in downtown Zagreb, Croatia, 23 June 2026. Reports state that in recent days Croatia has recorded high temperatures exceeding 35 degrees Celsius. Europe is bracing for a heatwave as forecasters predict temperatures could rise above 40 degrees Celsius. EPA/ANTONIO BAT

epa13058171 A man relaxes in the shade in downtown Zagreb, Croatia, 23 June 2026. Reports state that in recent days Croatia has recorded high temperatures exceeding 35 degrees Celsius. Europe is bracing for a heatwave as forecasters predict temperatures could rise above 40 degrees Celsius. EPA/ANTONIO BAT