What to Do in Paris During a Heatwave: Where to Cool Down in the 9th

The City of Paris counts around 1,400 "cool spots": parks and gardens with extended hours, pools, misting fountains, libraries, municipal museums, fifteen air-conditioned town halls, with ten more that can be added when demand rises. An entire network, almost invisible to newcomers in the capital, and one that changes everything on the days when going outside becomes an ordeal.

Here's how to get through a spell of intense heat from the 9th arrondissement: what's open, what's free, what only exists on Sundays, and the check to make before heading out with your towel under your arm.

Cool spots: the first thing to check

Two tools are enough. The dynamic map of cool spots, published on paris.fr, lists these points and lets you spot which ones are open near you. The free Extrema Paris app (iOS and Android) does the same from a phone: it geolocates the nearest cool spot in real time and shows the temperature by neighbourhood.

The appeal isn't theoretical. In a heatwave, the best option is always the closest one: a covered spot two streets away beats a big facility three transfers away, and walking between noon and 4pm costs more than it's worth.

Parks open until midnight

Every summer, a selection of Parisian parks and gardens extends its closing time to midnight, instead of the usual 9pm-9:30pm. The list and dates change from one season to the next and can expand during a heatwave: the late-night opening page on paris.fr remains the only up-to-date reference, worth checking before heading over.

From the neighbourhood, the simplest option is Parc Monceau (8th): three stops on line 2 from Place de Clichy, no change needed. It's one of the gardens covered by these extended hours, so you can stay out well past the usual closing time. These late nights fall right in the middle of the outdoor-events season, detailed in our guide to summer in Paris.

Swimming without crossing Paris

Piscine Georges Drigny, in the 9th

At 18 rue Bochart de Saron, it's open this summer. From 4 July to 30 August 2026: Monday 2pm-8pm, Tuesday to Saturday 10am-8pm, Sunday 8am-6pm, closed on 15 August. Standard admission costs €3.50, €2 at the reduced rate. A call to 01 45 26 86 93 or a look at its official page on paris.fr lets you check the day's hours before heading out. Access via line 2 to Anvers, then a few minutes on foot.

Paul Valeyre: closed until November

This is the other pool in the 9th, at 24 rue Marguerite de Rochechouart, and it's the classic summer mistake: it's closed for renovation from 6 July to 8 November 2026. No point making the trip, even in the evening.

Free swimming at the Bassin des Récollets

On the Canal Saint-Martin, at 116 quai de Jemmapes (10th), summer swimming is free, supervised by lifeguards, with a daily check on water quality. One significant constraint: it's Sundays only, from 2pm to 6pm, from 5 July to 6 September 2026. A single weekly slot means heavy crowds by design, so it's best to arrive right at opening.

Retreat indoors, for free

The heatwave plan also mobilises covered, air-conditioned venues: municipal libraries, municipal museums, Paris Anim' centres, sports facilities and air-conditioned town halls. The list of venues actually open varies from day to day; rather than relying on an address heard somewhere, open the cool spots map, which shows the active points around the 9th arrondissement.

The rhythm of a very hot day

A day that holds together looks like this: go out in the morning, while the air is still cool, for walks and visits; take shelter between noon and 4pm, the window when it's best to avoid getting around, in an air-conditioned place or simply somewhere quiet; head back out in the late afternoon to a pool or a park, once the city becomes bearable again. Pools and large gardens see their peak between 4pm and 7pm, for that matter: the morning opening and the late-night hours are far more comfortable.

One thing to check every morning: the heatwave alert level changes day by day, department by department, and is published continuously on vigilance.meteofrance.fr. That's what dictates the plan, not the night before.

From Hôtel R de Paris

At 41 rue de Clichy, everything starts from Place de Clichy (lines 2 and 13), with Liège (13) and Trinité-d'Estienne d'Orves (12) nearby. Line 2 leads without changing to Parc Monceau as well as to the Piscine Georges Drigny neighbourhood. All our rooms are air-conditioned, with individual settings: on scorching days, a genuine break in the mid-afternoon is often worth more than one more visit. For everything else (a cool address, a late dinner, an evening out), our digital concierge and the front desk are there for that.

The heat doesn't cancel a stay in Paris, it just shifts the hours: discovery in the morning and evening, shade in between. To plan ahead, our selection of activities in Paris still holds once the heatwave has passed.

And if the sky swings the other way, our ideas for a rainy day take over.