Cornwall · open water conditions information
Helford Passage (Mawnan Smith) is a coastal location in Cornwall, one of 128 Cornwall spots covered by NippyIndex.
The shore faces broadly north, so it is most open to wind and swell arriving from the north.
As a tidal location, its tide predictions are referenced to the nearest tidal station, Helford River (Entrance).
NippyIndex draws on published marine and weather data (sea state, wave information and water temperature), UKHO tidal predictions, and — for English coastal locations — Environment Agency bathing-water sampling where available.
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