Hot deal alert! Pushing open the door to a thermal spa without a prescription or a swimsuit is on the table this weekend.
The Immersion thermale weekend at the Thermes d'Enghien-les-Bains, in the Val-d'Oise (95), marks the launch of the first Immersions thermales on Saturday 24 and Sunday 25 October 2026. The facility will open to the public in the afternoon to tour its premises and explain how a cure works, with free access on pre-registration.
Typically these facilities are reserved for spa patients who come on medical prescription. This weekend, it’s a bit like being shown the restaurant’s kitchen: you finally see how it all works and who’s behind the treatments.
This nationwide campaign is being rolled out by the National Council of Thermal Establishments, with a simple objective: to make spa medicine better understood, still surrounded by a fair share of myths. Across France, dozens of establishments are taking part simultaneously, from Dax to Thonon-les-Bains, as listed on the official site of the Immersions thermales.
The ValVital group, which runs the Enghien site, links its 12 facilities to the event. All of them will open their doors over the weekend to showcase the itinerary of a spa-goer, the practices of the care professionals, and the ailments addressed by these cures.
No need to head to the Pyrenees or the Alps: Enghien-les-Bains remains the only spa in Île-de-France. It is licensed to treat respiratory ailments and ENT disorders. According to the spa, its waters have anti-allergic, decongestant, and bacteriostatic properties. They help clear the airways, cleanse the mucous membranes, and soothe inflammation.
Thermal cures are particularly prescribed for asthma, recurrent rhinitis, bronchitis, or repeated laryngitis. The spa welcomed 385 curistes in 2025 and is reporting a 45% rise in mini-cures, according to La Semaine de l'Île-de-France.
The history of these baths stretches back to 1766, when Abbé Cotte, an Oratorian priest from Montmorency, flagged the sulfur-rich qualities of the waters by the lake. Later, Louis XVIII is said to have treated a leg ulcer there, drawing Paris’s fashionable crowd. To this day, the office de tourisme d'Enghien-les-Bains presents these calcium-sulfur waters as among the most sulfurous in France.
To learn more about the treatments on offer for the rest of the year, we had already tested the anti-pollution wellness treatments at the Enghien-les-Bains thermal baths.
The visit to the Enghien-les-Bains thermal baths is free, but pre-registration is required via the Immersions thermales site. The facility welcomes guests only in the afternoon on Saturday, October 24 and Sunday, October 25, 2026. With limited spots, it’s best to book well in advance rather than waiting until the day before. To get there, Transilien line H runs from Gare du Nord to Enghien-les-Bains in about fifteen minutes, and the baths are just a short walk from the casino and the lake.
This day is first and foremost aimed at people who hesitate to embark on a treatment program, those coping with chronic breathing issues, or their loved ones. The curious will also find something for themselves: a clearer look at what happens behind these doors, without jargon. One note: this visit does not replace medical advice, and a conventional treatment remains subject to a prescription.
After the visit, the weekend can continue with a stroll around the Lac d'Enghien-les-Bains, famed for its Belle Époque villas, followed by a gourmet break at Le 85, the Grand Hôtel’s restaurant, or a stop at Mouillette Bakery. More ideas await in our guide “What to do this weekend in Paris and Île-de-France” and in our “Weekly deals” picks.
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Dates and Opening Time
From October 24, 2026 to October 25, 2026
Location
Les Thermes d'Enghien - Valvital
38 Rue de Malleville
95880 Enghien les Bains
Route planner
Accessibility info
Prices
Free
