---
title: Tide predictions (Instituto Hidrográfico)
summary: The official tide tables for Portuguese ports. A storm surge on a high spring tide is how Lisbon's riverside floods: the tide is astronomy, the surge is weather.
mount: <div class="card"><p class="kicker">Open data and APIs</p><div class="wx-scroll" tabindex="0"><svg class="mg" viewBox="0 0 994 56" width="994" height="56" role="img" aria-label="Tide predictions (Instituto Hidrográfico): what it is connected to"><style>.mg text{font:12px var(--sans);fill:var(--ink)}.mg .mg-sub,.mg .mg-verb{font-size:10px;fill:var(--ink-2)}.mg-node rect{fill:var(--surface);stroke:var(--line-2)}.mg-node.me rect{stroke:var(--focus);stroke-width:2}.mg-node.unstated rect{stroke-dasharray:2 3;fill:var(--paper)}a.mg-node:hover rect,a.mg-node:focus rect{stroke:var(--focus);stroke-width:2}.mg-edge{fill:none;stroke:var(--ink-2);stroke-opacity:.55;stroke-width:1}.mg-edge.unv{stroke-dasharray:5 4}</style><path class="mg-edge" d="M232 23C306 23 306 28 380 28"><title>stated on the page: hidrografico.pt</title></path><text class="mg-verb" x="240" y="19" text-anchor="start">publishes</text><a class="mg-node " href="body-ih.html"><rect x="2" y="8" width="230" height="30" rx="4"/><text x="9" y="21">Instituto Hidrográfico</text><text class="mg-sub" x="9" y="33">Bodies</text></a><g class="mg-node me"><rect x="380" y="13" width="230" height="30" rx="4"/><text x="387" y="26">Tide predictions (Instituto Hidrogr…</text><text class="mg-sub" x="387" y="38">Open data and APIs</text></g></svg></div><p class="wx-legend meta">Left: what points at it. Right: what it points at. Each line carries its verb; a dashed line was not confirmed on the page cited, or the site does not say; the table below gives the page and the time read for each. <span class="prov">From <a href="data-ih-tides.json">data-ih-tides.json</a></span></p></div>
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# Tide predictions (Instituto Hidrográfico)

> Kept by incident.meteorology@web-summit.dinis, 11 November 2026, 11:36 UTC

[Where a forecast comes from](../index.md) · Open data and APIs · id `data-ih-tides` · [as data](data-ih-tides.json)

The official tide tables for Portuguese ports. A storm surge on a high spring tide is how Lisbon's riverside floods: the tide is astronomy, the surge is weather.

**Address:** [https://www.hidrografico.pt/](https://www.hidrografico.pt/) (leaves this site)

## What it is connected to, and who says so

| This | Verb | That | The page that says so | Read | Check |
|---|---|---|---|---|---|
| Tide predictions (Instituto Hidrográfico) | **published by** | [Instituto Hidrográfico](body-ih.md) | [hidrografico.pt](https://www.hidrografico.pt/): "temporariamente indisponíveis. Tenta novamente mais tarde. Os dados são obtidos através da plataforma: Fechar Previsão de Marés Fechar Dia: Período 1 2 3 4 5 6 7 Os dados de marés estão temporariamente indisponíveis. Ten" | 11:28 UTC, 11 Nov | stated on the page |

## Licence: what we may do with it

No licence row yet covers this node: **unclear** until one does. [The licence table](../licences.md).

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Not a warning service: this page explains where data comes from. For warnings follow [IPMA](https://www.ipma.pt/pt/otempo/prev-sam/) and ANEPC.