Belgium's Royal Meteorological Institute issued an orange alert Wednesday as temperatures are set to exceed 35°C across most regions.
The UK's health authorities issued a rare red heat health alert for Wednesday and Thursday, with the Met Office forecasting 38°C in southern England. Tuesday saw 34.6°C at Wisley. Deputy chief forecaster Mark Sidaway warned of severe health impacts. At London Climate Action Week, UN Secretary General António Guterres said the city was "cooking."
France recorded its hottest day ever on Tuesday, prompting the Eiffel Tower and Louvre to restrict visiting hours. Italy's Health Ministry issued a "bollino rosso" red alert for 16 cities including Rome, Milan, Florence, and Turin, with Florence potentially reaching 41°C. Spain declared red weather alerts in five provinces as temperatures neared 40°C.
Eurostar canceled four London-Paris trains due to adverse weather.