Heatwave and high temperatures

When a heat warning is issued

Cover windows to prevent sunlight from entering. Keep windows and doors closed during the day and ventilate rooms at night when it is cooler outside. Use the cooler parts of your home, such as corridors or basements.
Use devices that create cool conditions indoors (fans or air conditioners). Cooling can also be aided by splashing yourself with cool water.
Stock up on food that does not require heating.
Ensure you drink plenty of water. Take a water bottle with you if you go outside.
Consider the safety of pets.
Be aware that high temperatures increase the risk of forest fires, wildfires, and general fire hazard.
Monitor the UV index, available from the Environmental Agency’s weather website.

Avoid prolonged exposure to direct sunlight. Stay indoors, particularly between 11.00 and 15.00, when temperatures are the highest.
Never leave children or animals in a stationary car.
Drink water frequently, even if you do not feel thirsty. Do not forget to eat. Avoid alcohol consumption.
Cool yourself in water whenever possible.
Keep vehicle windows open when travelling.
Wear light, airy clothing, a hat, and sunglasses.
Use sunscreen with at least SPF 30 when outdoors.
Avoid strenuous physical activity outside. If heat exhaustion occurs, use a cold pack on your neck.
In the event of suspected heat stroke (confusion, fever, nausea, headache, rapid pulse or fainting), call emergency services immediately. Move the affected person to a cool place, such as an air-conditioned car, shopping centre or shaded area if no other option is available. Offer cool drinks and remove excess clothing.

Temperatures of at least 30 °C over two consecutive days are considered hazardous.
The most vulnerable to extreme heat are children under 4 years old, people over 65, and individuals with chronic illnesses. Those with mobility difficulties or mental health conditions (including alcohol intoxication) are also at higher risk.
Cities may develop ‘heat islands’ or large dark surfaces (for example, asphalt roads, asphalt-covered car parks, bitumen roofs) that absorb most of the solar radiation. Heated surfaces, in turn, warm the urban air, making the area even hotter.