Douarnenez tide times

Île Tristan is accessible on foot via a sand bar that emerges only at the lowest spring low tides — the 2 to 3 days around maximum spring range, which occurs near new and full moon each month. The window is brief: the causeway is exposed for roughly 1 to 2 hours around the lowest point of the spring low water before the flood begins to cover it again. At neap tides and through most of the fortnightly spring-neap cycle, the island is surrounded by water. Check this page's tide table for the low water height — accessible crossings typically require a predicted low water of below 0.5 metres at the local datum. Always allow more return time than you think you need, as the flood covers the bar faster than most visitors expect.

Mean spring tidal range at Douarnenez is approximately 5.5 metres, with two high and two low tides each day. Neap range drops to roughly 2 metres. The 5.5-metre spring range means the outer beaches — Plage de Trez-Bellec, Plage des Dames, Plage de Sable Blanc — change substantially between low and high water. At low spring tide, rock platforms and reef exposed on the outer beaches provide access for shore fishing and rockpooling that is unavailable at any other tidal state. At high water on a spring, the beach width narrows considerably and swimming depth is reached close to the shore. Tide timing at Douarnenez shifts by approximately 50 minutes later each day across the lunar month.

The Port-Musée (Musée du Bateau) is an open-air maritime museum on the Tréboul quay in Douarnenez. It holds a collection of floating historic vessels — including a Thames sailing barge, a pilot schooner, a steam trawler, and other working craft — maintained in the harbour and accessible to visitors. The museum also operates as a working yard for traditional wooden boat repair, visible from the quay. The museum documents Douarnenez's sardine industry heritage and the broader history of Breton and European coastal working boats. It is one of the larger floating maritime collections in France and open from spring through autumn.

Surf breaks in the Douarnenez Bay area face SW to W swell from the Atlantic directly. The main surf beach is Plage de Sable Blanc, where a beach break works consistently on NW to W swell. The most manageable conditions for beginners and intermediates are typically around mid-tide on either the flood or the ebb — the lowest spring tides can expose too much reef and rocks on some sections, while high water at spring tide can eliminate the break altogether. A surf school operates at Sable Blanc. The beaches on the north side of the bay (Plage de Trez-Bellec) also receive swell but tend to be more exposed to wind. Spring through autumn is the most reliable period; winter brings the largest swell but also the most unpredictable conditions.

Predictions on this page come from Open-Meteo Marine, a free gridded global ocean model. They are model-derived, not from a dedicated local gauge at Douarnenez — accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height. For Douarnenez's 5.5-metre spring range, the height uncertainty is proportionally small, and these predictions are a reliable reference for beach planning, accessing Île Tristan, and timing surf or fishing sessions. For authoritative data, SHOM operates the French national tide gauge network at shom.fr.