Ireland · coast guide
Understanding the coast of Ireland
This guide explains the coast of Ireland on the Atlantic; calculations, observations and product limits remain distinct.
Read a local tide
Ireland’s Atlantic coast, Irish Sea and many bays should be read from a named station or model location. The Marine Institute distinguishes harmonic predictions from its regional model output, so the label matters as much as the time. A value for Galway Bay is not automatically a value for an open west-coast beach.
Tidal range and coast
Tidal range changes around headlands, in estuaries and inside bays. That variation is a local coastal effect, not a national coefficient. Start with the named prediction location, then use local charts, access information and on-site signs for the shore you are considering.
Prediction, model and observation
A harmonic prediction describes the periodic tide; a model and a station observation have different assumptions and timestamps. Wind, pressure and waves can alter conditions at the shore. Keep those products separate and do not treat a missing observation as confirmation that conditions are unchanged.
Plan a coast visit
Bathing notices, shellfish rules, harbour restrictions and access routes are published by the relevant local authority or competent body. Check them before visiting a beach, pier or estuary. This guide helps identify sources but does not decide whether an activity is permitted or appropriate.
Reviewed source
This page cites and links to this public reference; it does not reproduce its tables.
Reviewed 2026-09-11.