On Monday 30 June 2025, the severe weather risk assessment unit (CERI) convened in light of the orange alert for high temperatures issued by MeteoLux for Tuesday 1 July 2025.
The warning is in effect for the entire country from 12:00 to 21:00 on Tuesday, with maximum temperatures expected to reach 32°C to 35°C. Temperatures exceeding 35°C are similarly forecast for Wednesday 2 July 2025.
The CERI has issued a reminder of key health risks and recommended behaviours amid the heatwave.
High temperatures may lead to dehydration or heatstroke, particularly for the elderly, young children, people with chronic illnesses or mental health disorders, people taking specific medications and individuals living in isolation. Warning signs of heatstroke include a fever above 40°C, hot, red and dry skin, headache, nausea, drowsiness, intense thirst, confusion, seizures and loss of consciousness.
To limit health risks, the public is advised to:
- drink plenty of water regularly throughout the day (1.5 litres per day);
- avoid going outside (prolonged and direct exposure to the sun) during the hottest hours of the day, i.e. 11:00-21:00;
- close blinds / shutters, curtains and windows during the day and ventilate homes at night;
- wear light clothing and head coverings outdoors;
- limit physical activity;
- check in on vulnerable individuals and help them access cool areas.
The CERI will meet again on Tuesday late morning to take stock of the situation and issue further updates as needed.
For more information, visit www.infocrise.lu.
