Tide Table Viana do Castelo — 2026

📘 About Viana do Castelo Tide Forecast

The coordinates for Viana do Castelo (41.69° N, 8.83° W) place this stretch of Portugal's coast in the northern hemisphere. Its tidal pattern is semi-diurnal (two high and two low tides per day), with a mean tidal range of 1.8m and spring tides reaching up to 2.6m. With 1.5–3 metre swings, high tide floods extensive tidal flats while low tide reveals coastal habitats important to local wildlife. Two daily tidal cycles create two current peaks per day, valued by anglers who leverage stronger flow during tidal changes. Tidal dynamics in this bay or inlet are shaped by the geometry of its entrance, which can amplify or reduce range relative to the open sea. The 2026 tidal schedule for Viana do Castelo provides a full-year calendar of high and low waters alongside predicted sea levels. In September, Viana do Castelo is in its autumn season, a key period for water sports, fishing, diving, and coastal navigation. All tide predictions are computed from harmonic constants validated for this coastal station, with accuracy within ±15 minutes for most conditions.