Heatwave: red alert remains in force this weekend of July 11–12 in Île-de-France

Published by My de Sortiraparis · Photos by My de Sortiraparis · Updated on July 11, 2026 at 08:33 a.m.
The heatwave shows no signs of easing in Île-de-France: Météo-France is maintaining red alert for the eight departments of the Île-de-France region this Saturday, July 11, and Sunday, July 12, 2026, with temperatures expected to top out at 39°C in the southern part of the region.

The red heatwave alert is now in effect across the entire Île-de-France. Météo-France confirmed in its bulletin for Saturday, July 11, 2026 that eight Île-de-France departments (75, 77, 78, 91, 92, 93, 94 and 95) switch to red from noon this Saturday, with the level remaining in force on Sunday. The Centre-Val de Loire region and the Orne department (61) are treated the same, while the Nord, Pas-de-Calais and Somme move up to orange.

The numbers from Friday set the scene: highs of up to 41.4°C recorded in Saint-Côme-d'Olt (12), 41°C in Châteaumeillant (18) and in Tusson (16), with monthly records broken. In Île-de-France, the mercury rose between 35°C and 37°C, peaking at 37.1°C in Saint-Maur.

Why is the red heatwave alert still in effect?

A scorching air mass has lingered over the country for days, barely moving. Météo-France warns of a severe and sustained heatwave, prompting heightened vigilance for vulnerable or exposed individuals.

The nights are what weigh on people the most. This Saturday at 5 a.m., it was still 24.4°C at Lariboisière, right in the heart of Paris’s urban heat island, compared with 20.3°C at Longchamp. In other words, the city isn’t cooling down, and the body isn’t getting its rest.

Heatwave in Paris (75): temperatures up to 38°C this Saturday and Sunday

In the capital, the forecasted highs for Saturday afternoon are expected to climb to 36–38°C. Saturday night into Sunday remains sweltering, with lows of 21–24°C. Sunday afternoon brings another stretch of 36–38°C. No relief appears likely before the week begins.

Heatwave in Hauts-de-Seine (92)

Météo-France has issued a joint bulletin for the inner suburbs, and Hauts-de-Seine is tracking Paris's trajectory: 36–38°C Saturday afternoon, overnight lows of 21–24°C, then another 36–38°C on Sunday. The Longchamp station, on the department’s border, recorded 35.1°C on Friday.

Heatwave Hits Seine-Saint-Denis (93)

The same pattern in Seine-Saint-Denis, with highs of 36 to 38°C on Saturday and Sunday and nights that won’t cool below 21 to 24°C. The department faces a slew of compounding heat factors (high population density, bare mineral surfaces, limited vegetation), making nighttime heat especially oppressive.

Heatwave in Val-de-Marne (94)

Val-de-Marne tops Friday’s Île-de-France heat record, with 37.1°C recorded in Saint-Maur. Forecasts remain in line with those for the inner suburbs: 36–38°C on Saturday, overnight lows of 21–24°C, and 36–38°C Sunday afternoon.

Heatwave in Seine-et-Marne (77): the warmest department

This is where the heatwave hits hardest. This Saturday afternoon, temperatures are forecast to reach 36 to 38°C, locally up to 39°C in the southern part of the department. On Sunday, the range widens again: from 35 to 39°C, with the highest readings still in the south of Seine-et-Marne.

The nights there are a touch easier to bear than in Paris, with overnight lows of 19 to 23°C. This Saturday morning, it was 18.5°C in Changis, but already 23°C in Vaux-sur-Lunain.

Heatwave Hits Essonne (91)

Essonne braces for near-record heat, with 35–38°C expected Saturday afternoon and up to 39°C possible in the department’s southern reaches. On Sunday, thermometers should again register 36–38°C, with a continued risk of hitting 39°C at the peak. Overnight, temperatures will dip only slightly, between 20 and 24°C.

The department is already paying a heavy price: the prefecture has banned fireworks and access to woods and forests until July 15, 2026, inclusive.

Heatwave in Yvelines (78)

The Yvelines are forecast to reach 35 to 38°C on Saturday afternoon, then again 35 to 38°C on Sunday. Overnight temperatures will stay between 19 and 23°C. The Saint-Léger station recorded 37.2°C on Friday, the highest reading in the department.

Heatwave Hits Val-d'Oise (95)

The Val-d’Oise is faring a bit better, but it’s far from out of the woods. Temperatures are forecast to hit 35–37°C on Saturday and Sunday, with nighttime lows of 19–22°C. On Friday, the department recorded the region’s coolest readings, from 33.6°C in Pontoise to 35.2°C at Le Bourget.

How long will the heatwave last in Île-de-France?

The spell of heat is set to continue at least until mid next week. Météo-France is signaling a likely start to cooler temperatures in the country’s western regions at the beginning of the week, but Île-de-France will not feel the relief until later. We lay out the timetable in our update on the end of the heatwave in Île-de-France.

Heatwave: how it will affect Bastille Day and where to cool down

The switch to red isn't without consequence for the National Holiday. Faced with drought and the fire risk, many municipalities are canceling or postponing their fireworks displays, as shown by the list of fireworks canceled in Île-de-France. This is the case for all fireworks in the Essonne, Seine-et-Marne, the Val-d'Oise and the Yvelines. T

Under red alert, prefectures can also postpone or cancel outdoor sporting events, boost patrols around swimming areas, and extend the hours of pools and green spaces. Some venues are adjusting their hours or closing as well—check before you travel. As for everyday habits, stay hydrated, close shutters and windows during the day to keep interiors cool at night, avoid strenuous activity during the hottest hours, and check on elderly or isolated friends and relatives. The Canicule Info Service helpline (0 800 06 66 66) operates from 9 a.m. to 7 p.m., and if you feel unwell or have incoherent speech, call 15.

To beat the heat, we head for the pools, leisure centers, shaded parks, and air-conditioned venues listed in our guide to ideas for cooling off in Paris and the Île-de-France region.

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Practical information

Dates and Opening Time
From July 11, 2026 to July 12, 2026

× Approximate opening times: to confirm opening times, please contact the establishment.

    Location

    75 Paris

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