Cap d'Agde tide times

Cap d'Agde sits on a volcanic basalt outcrop — the remnant of a volcano that was active approximately 750,000 years ago. The Agde volcano produced the basalt ridge that forms the cape, and the dark stone was historically quarried for building the town of Agde itself (one of the oldest continuously inhabited towns in France). The hard volcanic rock resists the coastal erosion that continuously reshapes the sandy barrier beaches to either side, making Cap d'Agde a stable geographic feature on an otherwise low and dynamic shoreline.

The inner marina basins have lock-controlled access that maintains a relatively stable water level. Tidal variation is under 0.3 m on this coast, so depth in the approach channel is more dependent on wind-driven sea state and swell than on the tide. The outer harbour and the Grau d'Agde entrance channel are subject to bar conditions and swell; navigation timing decisions should be based on sea state and swell forecasts rather than tide height. Consult current Navicarte charts and the marina authority for approach guidance.

Wind and barometric pressure dominate. The Marin — a warm, humid southwesterly wind — builds across the Gulf of Lion and pushes water against the coast; strong Marin events can raise sea level 0.3–0.5 m above baseline. The Tramontane, a cold northwesterly, lowers levels and typically arrives with clear skies and calmer seas. Low barometric pressure adds approximately 1 cm per hPa below 1013 hPa through the inverse barometer effect. Astronomical tides contribute under 0.3 m of total range — less than a typical Marin episode produces in a few hours.

The main town beaches (Plage Richelieu, Plage du Môle) face south toward the Gulf of Lion and are broad, sandy, and well-served by the resort infrastructure. They receive the benefit of the volcanic cape's partial shelter from westerly swell. Plage de la Tamarissière, west of the Hérault river mouth, is quieter and has a more natural character. Sea temperature is comfortable for swimming from late June through September, peaking around 24–25°C in August. There are no tidal restrictions on swimming — the range is under 0.3 m.

Sea-level predictions on this page are generated from Open-Meteo Marine models (±45 min, ±0.2–0.3 m). For official coastal water level records and storm-surge data, consult SHOM at shom.fr. For navigation in the Cap d'Agde marina approach, the Grau d'Agde channel, and the Hérault river mouth, use current-edition Navicarte charts and follow the marina authority's guidance on approach conditions. Do not use this page as a substitute for official charts and hydrographic sources when navigating.