Porthcressa and Pelistry Bay Tide Times
St Mary's beach planning using the validated Isles of Scilly gauge.
Tide times from the St Mary's gauge
These are the validated St Mary's gauge times shown in UK local time. They are not adjusted with a guessed beach offset. Heights are metres above Ordnance Datum (mAOD), not chart datum.
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Prediction file generated 07 Sep 2026. Weather and air pressure can move real sea level away from the prediction.
Source gauge
The source tide page is St Mary's. Heights are shown in mAOD, not chart datum, and the gauge page includes the live gauge check and the full 14-day tide curve.
Beach characteristic
Porthcressa and Pelistry Bay are on St Mary's in the Isles of Scilly. The St Mary's gauge is the validated source for broad local tide planning.
Places covered on this guide
Use a safety margin
For beach walks, coves, causeways and cliff-backed beaches, check the return route as well as the next low water. Weather, swell and air pressure can move the real sea level away from the astronomical prediction.