Is Plage du Grand Marchais good for swimming today?
Plage du Grand Marchais has BeachFinder Score: 86/100. Use this as a planning signal only, then check local flags, lifeguards, closures and current beach conditions.
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FR-W - FR
Plage du Grand Marchais
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Quick answer
Quick answer: Plage du Grand Marchais today
Plage du Grand Marchais is a BeachFinder spot in FR-W, FR. Today, compare water temperature 23°C, wind 14 km/h · SW, uv 7.0, waves 0.4 m, water quality Check official advisories before leaving. BeachFinder Score: 86/100. Always check official flags, closures and lifeguard advice before swimming.
Water temperature
23°C
Wind
14 km/h · SW
UV
7.0
Waves
0.4 m
Water quality
Check official advisories
Last updated: Aug 11, 03:15 PM local forecast timeBeachFinder Score: 86/100
Sources: Open-Meteo weather and marine forecasts, OpenStreetMap place context and BeachFinder spot data.
This is planning information, not a safety clearance. Conditions can change quickly.
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Live conditions on the site
Surfers can check wind, wave height, currents and surf cues here before opening the full BeachFinder app.
Updated: Aug 11, 03:15 PM
Water temp
23°C
Air temp
33°C
Feels like
31°C
UV index
7.0
Wind
14 km/h · SW
Gust 28 km/h
Waves
0.4 m
Current
1 km/h · E
Parking
...
Shower
...
Accessible access
...
Toilets
...
Restaurants
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Weather and marine data: Open-Meteo
Plage du Grand Marchais
Grand Marchais Beach stretches along the Atlantic coast of Vendée, about 15 kilometers south of Saint-Clément-des-Baleines and within the orbit of Île de Ré. This stretch of the Charente-Vendée coastline belongs to the French oceanic facade characterized by mudflats, fine sandy beaches, and low coasts where the intertidal zone generously extends at low tide. The area, dominated by Atlantic disturbances and tidal currents, composes a typically Vendéen coastal landscape: low dunes, halophytic meadows, and back beaches often covered with seaweed. Backed by a sparsely urbanized coastline, this beach stands out for its tranquil character and distance from concentrated tourist developments. 1.5 kilometers to the north is Lizay Beach, while Boutillon Beach is located 6.2 kilometers to the southeast. Unlike its immediate neighbors, Grand Marchais retains a wilder appearance, with direct access from rural paths and reduced foot traffic outside the peak summer season. The sand, fine and slightly gray depending on seasonal sediment deposits, gives way to rocky areas at low tide, revealing small pools and rocky bottoms suitable for exploration. The site remains without official supervision and does not hold the Blue Flag label. No structured facilities (toilets, showers, designated parking) are reported in the cadastral data. This lack of infrastructure reflects its status as a rural beach, accessible mainly to motorized visitors with local knowledge. The absence of accessibility signage for people with reduced mobility confirms its profile as a minimally developed site.
About this spot
The toponym "Grand Marchais" refers to the human geography of Vendée: "marchais" historically designates marshy lands and coastal wetlands, which were prevalent in this region before the major drainage works of the 19th century. This beach is part of the geomorphological system of the low Atlantic coasts, where the alternation of tides creates landscapes in perpetual transformation. During the equinox spring tides, the water can recede more than 12 meters, exposing stretches of sand and rock that locals explore on foot or with sand yachts—a practice still vibrant in Vendée despite the evolution of coastal leisure.
Updated 5/9/2026
Frequently asked questions
What is the water temperature at Plage du Grand Marchais today?
23°C. Marine temperature is shown when forecast coverage is available for this location.
How windy is Plage du Grand Marchais today?
14 km/h · SW. Wind can change comfort and surface conditions, especially on exposed beaches.
What should I check before swimming at Plage du Grand Marchais?
Check official safety flags, lifeguard advice, closures, water-quality advisories, UV, wind, waves and currents before entering the water.
Before you go
Conditions
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