Cascais tide times

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived.

Model-derived from a global ocean grid. Useful indication; expect about ±45 minutes on average vs. a local harmonic gauge, individual stations vary widely. See /methodology for per-region detail. Not for navigation.

Conditions as of 05:00 local time. Refreshes daily.

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived. · Not for navigation.

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are Europe/Lisbon local. Folk tradition, not a scientific forecast.

Next spring tide on Mon 18 May (range 3.1m). Next neap on Thu 21 May.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

Cascais is 30 kilometres west of Lisbon on the Estoril coast, where the Tagus estuary meets the Atlantic at Cabo da Roca — the westernmost point of continental Europe. The town has a working fishing harbour, a palace-turned-museum, and beaches facing north into the sheltered bay (protected from Atlantic swell) and west toward the open ocean. Tidal range is macrotidal by Iberian standards: mean spring range around 3.0 metres, with springs reaching 3.8 m. The Atlantic exposure and strong tidal range make Cascais one of the most tide-aware beach towns in Portugal. The Boca do Inferno (Mouth of Hell) — a sea arch carved by Atlantic waves from the limestone cliff 2 km west of town — is the most dramatic geological feature near Cascais. At high water in swell conditions, waves compress through the arch and explode upward through the blowhole; the spectacle is safe to observe from the cliff path. At low water the arch and the sea cave behind it are accessible by rock scramble from the beach level. The tidal state determines which experience is available. Surf at Cascais is primarily at Praia do Guincho — a 9-km Atlantic beach 10 km west of the town, famous for consistent northwest swell and the persistent afternoon wind that makes it the premier windsurfing and kitesurfing beach near Lisbon. The wind funnels off Cabo da Roca and accelerates along the beach; 20 to 35 knots is the summer afternoon norm. The surf is strong, the water cold (15 to 18°C year-round due to the Canary Current upwelling), and the beach is backed by dunes on the Sintra-Cascais Natural Park. The town beaches (Praia da Rainha, Praia de Cascais) face east and are sheltered from Atlantic swell; they're swimming beaches for families with calm water even in significant swell conditions. The fishing harbour in the centre of town operates independently of the resort beach culture — lobster and barnacle (percebes, the Galician-style barnacles that grow on Atlantic rock faces) are sold at the harbour fish market in the morning. Percebes harvesting on the Atlantic cliffs west of Cascais is a low-water exercise. The goose barnacles grow on the most exposed, wave-battered rocks; harvesters (percebeiros) work the lowest sections accessible only at spring low tides, between waves. It is dangerous work — the Portuguese coast has significant casualties among percebeiros. The barnacles sold at Lisbon and Cascais restaurants come from this tradition. Predictions on this page come from Open-Meteo Marine, a gridded global ocean model, cross-referenced with Instituto Hidrográfico predictions. For the most accurate Portuguese tide predictions, consult the Instituto Hidrográfico at hidrografico.pt.