Please read this before you walk anywhere the tide can reach. Effective 1 October 2026.
Our tide predictor and related tools approximate the tide using a small set of astronomical cycles (mainly the lunar M2 constituent). This reproduces the familiar rhythm of tides well enough for planning, but it is calibrated from a single reference point — the next high tide you enter. Real tide times and heights at any given harbour can shift by tens of minutes and tens of centimetres because of local geography, bathymetry, wind and atmospheric pressure.
Therefore treat every output on this site as an estimate to build your plan around, not as a measurement to bet your safety on.
Before every trip, confirm high and low water times against the authoritative source for your shore: your national hydrographic office, the port or harbour authority, a published tide table, or an official harbour notice board. If our tool and the official table disagree, the official table is correct.
Coastal environments — including sandbars, rock platforms, sea caves, causeways and tidal islands — can become cut off by rising water without warning. Flash flooding, unexpected large waves (“sneaker waves”), slippery rock, cold water and rip currents are real hazards. We are not present at your location and cannot assess conditions for you. You — and, where relevant, a responsible adult supervising children — are fully responsible for judging whether it is safe to go, stay and return.
Nothing on this site is a substitute for a qualified meteorological forecast, a maritime safety notice, lifeguard instruction, or emergency services guidance. We do not provide rescue, and we are not affiliated with any rescue organisation. In an emergency, call your local emergency number immediately.
Where we link to official weather, tide or safety services, we do so for convenience; we are not responsible for their accuracy or availability.
Questions? zjp133@outlook.com