Luxembourg celebrated its National Day on 23 June 2026, the first of Grand Duke Guillaume's reign, with a Philharmonie ceremony, military parade and Te Deum — even as a severe heatwave and a red weather warning gripped the country.
A man was left fighting for his life after a knife attack on the fringes of Luxembourg City's City Sounds concerts on National Day. Two suspects were detained, and police stressed there was no confirmed link to a separate stabbing in Clausen hours earlier.
On his first National Day as reigning Grand Duke, Guillaume reviewed the military parade on Avenue de la Liberté and presided over the official ceremony at the Philharmonie, marking the symbolic start of a new reign eight months after Henri's abdication — and against a backdrop of record June heat.
On the eve of Luxembourg's 23 June National Day, Prime Minister Luc Frieden is due to deliver the government's flagship annual address, extending the social-cohesion message of his May state-of-the-nation speech. The celebrations unfold under a red-alert heatwave and mark Grand Duke Guillaume's first National Day as reigning sovereign.
Luxembourg's weather service has raised its alert to the highest level for an extreme heatwave forecast to push local temperatures toward 40°C, triggering a coordinated state response as France, Spain and the UK also swelter under a persistent heat dome.
Luxembourg will raise its heat warning to red from midday Monday, 22 June, as a Europe-wide heatwave pushes temperatures toward 40°C, disrupts the Luxembourg-Metz railway and tests emergency services on the eve of National Day.