When the thermometer climbs past 35°C, Parisians fall back on habits you won't find in guidebooks. Parks after dark, the pool at opening time, a nap in an air-conditioned library: here is where the city actually goes when it overheats, with links to find each kind of place near you.
Which Paris parks stay open at night during a heatwave?
During heatwave episodes, the City of Paris keeps part of its parks and gardens open around the clock as night-time refuges. The exact list changes with every episode and every summer: check paris.fr during an alert.
It is the most Parisian reflex there is: as dusk falls, everyone migrates to the lawns. The large, densely planted parks are among the city's official "cool islands" (îlots de fraîcheur): under a thick canopy, the air is noticeably cooler than in the street. → Find a park near you
The municipal pools
Paris has around forty municipal swimming pools, and during hot spells the city often extends the opening hours of some of them — check the day's hours before you go, and expect crowds. The regulars' trick: aim for the morning opening or the lunchtime slot, before the whole neighbourhood has the same idea. → Find a pool
Can you swim in the Seine in Paris?
Yes — in summer, at supervised sites. Since swimming returned to the Seine, you really can swim in the river: the Bras Marie site, at the foot of Pont Louis-Philippe, is announced as open daily in season — hours and capacity to be checked on paris.fr. The Bassin de la Villette also runs its supervised summer swimming spot.
Around them, every summer, Paris Plages sets up deckchairs, shade structures, water games and free activities along the Rives de Seine and at the Bassin de la Villette. For 2026, the city has announced an edition running from 4 July to 30 August — dates announced by the town hall, verify before you go.
Drinking fountains and misters
Eau de Paris maintains some 1,300 public fountains in the streets and gardens: the water is free, safe and of top quality — the same water as the tap. Refill your bottle instead of buying plastic ones. In summer they are joined by misting fountains and "2-in-1" fountains that combine drinking water with a cooling mist — kids approve. → Find a fountain
What is an "îlot de fraîcheur" (cool island)?
An îlot de fraîcheur is a public place listed by the City of Paris as noticeably cooler than its immediate surroundings — the official list counts more than 1,400 of them: shaded parks, fountains, pools, air-conditioned libraries, museums, churches, plus the cooled rooms that town halls open during heatwaves. Our cool-places map follows the same logic, with opening hours and comfort attributes for every place.
Museums, libraries, churches: the cultural siesta
A heatwave afternoon is the best moment of the year for cultural venues: air-conditioned municipal libraries (free, with wifi, where nobody hurries you), cool and quiet museums on weekdays, stone churches where the temperature drops several degrees the moment you step through the porch. Air-conditioned department stores and shopping centres play the same role, window-shopping edition. → Museums · Libraries
In the evening: riverbanks, squares, shaded terraces
After 8 pm, the city moves back outdoors: the banks of the Seine, the Canal Saint-Martin quays, shaded squares where people sit straight on the finally-lukewarm stone. Heatwave nights stay warm in Paris — that's the urban heat island — but the air is more breathable than a badly ventilated flat, and it is when the city is at its best.
Want to know where to go right now, based on today's heat? → How hot is it right now?