Red Heat Warning for Luxembourg Extended Until Sunday Morning

Following a meeting of Luxembourg’s Severe Weather and Flood Risk Assessment Unit (CERI) on the afternoon of Thursday 25 June 2026, the red alert for exceptionally high temperatures has now been extended to 07.00 on Sunday 28 June.

CERI said that temperatures will continue to rise over the next few days, with the peak expected on Saturday 27 June, and maximum temperatures could locally reach or even exceed 40°C, particularly in urban areas and in the Moselle Valley.

Night-time temperatures will also remain exceptionally high, with several consecutive tropical nights. The night from Saturday 27 to Sunday 28 June is expected to be the hottest of the heatwave, with minimum temperatures locally remaining between 24°C and 26°C.

Following the extension of the red warning, Luxembourg’s Ministry of the Environment, Climate and Biodiversity has authorised that outdoor construction work may commence from 06:00 instead of 07:00 for the duration of the Red Alert.

This measure is intended to reduce workers' exposure to the highest temperatures of the day while ensuring that construction activities can continue under conditions appropriate to the current climatic circumstances.

In view of the exceptional weather conditions expected this weekend, Luxembourg’s Ministry of Sport is calling for the utmost caution in relation to sporting events.

Where safe conditions cannot be guaranteed, organisers are advised to postpone or cancel the activities concerned. Where events do proceed, organisers should carefully reassess whether competitions, sporting events and outdoor gatherings can safely take place and ensure that all necessary measures are implemented to protect participants and spectators.

The public authorities remind everyone to follow these recommendations:

• drink plenty of water regularly throughout the day (at least 1.5 L daily);

• avoid drinking alcohol;

• avoid going outside during the hottest part of the day (11.00 a.m. to 9.00 p.m.), particularly for prolonged periods or in direct sunlight;

• keep shutters, blinds, curtains and windows closed during the day, and ventilate your home at night;

• wear a hat or other head covering when outdoors;

• wear lightweight clothing;

• limit physical activity;

• use fans or air conditioning to keep cool;

• whenever possible, stay in a cool or air-conditioned place (such as shopping centres, cinemas or other public buildings);

• cool yourself several times a day using a mist spray, cool shower or similar methods;

• keep in regular contact with vulnerable relatives, friends and neighbours, and help them access cool environments where possible;

• medication: some medicines may increase sensitivity to heat, contribute to dehydration or become less well tolerated during periods of extreme heat. Never alter your treatment without medical advice, avoid self-medication, and consult your doctor or pharmacist if you have any concerns.

In the same context, the Prevention Department of the Accident Insurance Association (AAA) reminds the public that it offers a specialist advisory service for agricultural holdings. This service helps farmers identify occupational health and safety risks, particularly those associated with periods of extreme heat, implement appropriate preventive measures, ensure compliance with legal obligations, and enhance the safety of agricultural workers.