Saint-Malo, Brittany tide times

The hero block shows the next high tide at Saint-Malo harbour in local Central European time. The 7-day table covers all four daily extremes. The big spring tides of the equinoxes (March and September) produce the largest swings of the year — the official 'grandes marées' calendar in France lists those dates well in advance.

The Bay of Saint-Malo and the broader Mont-Saint-Michel embayment funnel the open-Atlantic tide into a constricted triangle. The geometry amplifies the astronomical signal in the same way the Bay of Fundy does on the Canadian coast. Spring tides at Saint-Malo top 12 metres at the equinoxes — only a handful of places worldwide run bigger swings.

Open-Meteo's marine model produces the predictions on this page — gridded data, useful for daily planning but not for piloting. SHOM is the authoritative French tide source. The Saint-Malo harmonic record is one of the longest continuous gauge records in Europe and SHOM's predictions for it are navigation-grade.

The plage de Bon-Secours and the fortifications coast widen by hundreds of metres on the biggest spring tides of the lunar month. The 'grandes marées' around the equinoxes produce the most dramatic exposures. The 7-day table on this page flags each day's lowest predicted tide. Walk back well before the flood: the rate of rise on a 12-metre cycle is fast — a spring flood at Saint-Malo runs about a metre of vertical rise every fifteen minutes near mid-flood.

No. Saint-Malo is a major commercial harbour with locked basins, a tidal sill, and ferry traffic to the Channel Islands. For piloting use SHOM's authoritative tide tables, the harbour's own published times for the écluse, and the latest Avis aux Navigateurs. The currents in the Rance estuary and around the offshore reefs of the Cancale plateau need real navigational sources.