© Grandes marées sur les brise-lames de la cité Corsaire | Michaël Auvret

Tidal information in Ille‑et‑Vilaine

Because seaside visits and walks in Brittany are dependent on the tides, it is essential to consult the tide times before you go out.

Large tidal ranges in 2021 in Saint-Malo bay

      • Monday 1stMarch (Coefficient 106)
      • Tuesday 30th March (Coefficient 113)
      • Wednesday 28th April (Coefficient 112)
      • Wednesday 26th May (Coefficient 105)
      • Thursday 27th May (Coefficient 105)
      • Thursday 9th September (Coefficient 102)
      • Wednesday 6th October (Coefficient 103)

Consult the tide times and their coefficients around Saint-Malo in real-time here.

Tidal information

Good to know

HT high tide: the tide is in
LT low tide: the tide is out
Coeff. tidal coefficient: the amplitude of the tide. It is between 20 and 120, with 120 being the maximum. The higher it is, the greater the ebb at LT and the higher the sea at HT.

A spring tide is when the coefficient is greater than 100.
In Saint-Malo bay, the tidal range – i.e. the difference in the height of the water between high tide and low tide – is exceptional and can reach 13 metres! This makes Saint-Malo, and in particular the Bay of Mont Saint-Michel, the setting for the largest tides in Europe. The biggest tides are the equinox tides, which occur in March and September.

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