Guide · Risks in France

Heatwave: protecting every member of the household

The same advice isn't enough for everyone. What protects a healthy adult isn't always enough for a baby, an elder or a pet.

Updated September 20, 2026Reading: 6 minOfficial source cited at the bottom of the page
In brief

During a heatwave: drink regularly without waiting to feel thirsty, cool your body (face, forearms, water spray), close shutters and windows facing the sun during the day and open at night, and avoid exertion between 12pm and 6pm. A fever above 39°C with hot, dry skin, intense headaches or confusion are signs of heatstroke: call emergency services without delay.

The official actions

According to the Ministry of Health, in a heatwave:

ActionIn practice
Stay hydratedDrink water regularly, without waiting to feel thirsty. Avoid alcohol, very sugary or caffeinated drinks.
Cool downWet your face and forearms several times a day, use a water spray, take room-temperature showers.
Eat normallyDon't skip meals even if appetite decreases; favour fruit, raw vegetables, cold soups.
Keep the home coolClose shutters and windows facing the sun during the day, open widely at night once outside air cools down.
Avoid exposureStay in a cool place during the hottest hours; no intense physical activity between 12pm and 6pm.
Check inLet relatives know you're okay, and check on isolated people.

Recognising heatstroke

Medical emergency, call emergency services: fever above 39°C, hot, red and dry skin (no sweating), intense headaches, dizziness, nausea, incoherent speech, unusual behaviour or loss of consciousness.

These symptoms can appear quickly, especially in vulnerable people. When in doubt, it's better to call than to wait.

The most exposed people

While heat affects everyone, some people regulate their temperature less well or feel thirst less:

Pets too

A pet doesn't regulate its temperature like a human. Always provide fresh water at will, avoid walks during hot hours, and never leave a pet in a car, even with the window slightly open.

Mistakes to avoid

With LASTLINE

The needs of each household member

LASTLINE can help you:

LASTLINE doesn't replace medical advice: in case of a heatstroke sign, call emergency services.

Track my area's warnings

Frequently asked questions

What are the signs of heatstroke?

A fever above 39°C, hot, red and dry skin with no sweating, intense headaches, dizziness, nausea, incoherent speech or loss of consciousness. These are medical emergency signs: call emergency services immediately.

Who is most at risk during a heatwave?

Elderly people, infants, pregnant women, people on medication and those working outdoors are particularly vulnerable, because their bodies regulate temperature less well.

Is there a dedicated number for heatwave questions?

Yes, in France the Canicule info service platform answers questions at 0 800 06 66 66 (free call), Monday to Sunday from 9am to 7pm.

Sources

  1. Santé.fr, Extreme heat and heatwaves: protecting yourself and your loved ones, dossier compiled with the Ministry of Health, Ameli.fr and Santé publique France.