Knokke-Heist 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 10:00 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/Brussels local. Folk tradition, not a scientific forecast.

Last spring tide on Thu 30 Apr (range 3.8m). Next neap on Wed 06 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.

Knokke-Heist sits at the northeastern end of the Belgian coast, the last municipality before the Dutch border and the Westerschelde estuary mouth. It is a single coastal commune that runs through Heist, Duinbergen, Albertstrand, Knokke, and the protected Het Zwin nature reserve at the Dutch frontier — about twelve kilometres of beachfront in total, with the Zeedijk-Heist promenade running the length of the seawall and the Casino Knokke and the Albertplein anchoring the resort end. Het Zwin, on the border with the Netherlands, is the saltmarsh that once formed the medieval Bruges shipping channel before silting up; today it is a 158-hectare cross-border tidal nature reserve managed jointly with the Dutch Zeeuws-Vlaanderen authorities, with a network of dykes, salt-tolerant vegetation, and migratory bird traffic that is one of the most active on the southern North Sea coast. Zeebrugge port — Belgium's largest container and roll-on roll-off port — sits roughly five kilometres west of Knokke. The tide at Knokke-Heist is the full North Sea macrotidal regime, and slightly larger than Ostend because the coast here approaches the Westerschelde estuary mouth, which acts as a partial funnel and amplifies the tidal range marginally as the wave propagates into the estuary. Mean range at the Knokke-Heist gauge area is around 4.0 to 4.7 metres — a touch above Ostend's 3.8 to 4.5 metres. Two highs and two lows daily, twelve hours and twenty-five minutes apart, with the same clean semidiurnal North Sea signal. Spring tides around new and full moons push toward 5.2 metres; neap tides during the quarter moons compress toward 3 metres. The wide intertidal sand flats expose several hundred metres at low water, and at Het Zwin the tide actually runs into the saltmarsh through the controlled inlet from the sea, flushing the marsh creeks and the salt-tolerant vegetation on each tidal cycle. That tidal-marsh flushing is what keeps Het Zwin functioning as a coastal saltmarsh rather than reverting to a freshwater system. Anglers along the Heist jetty and the Albertstrand groynes target sea bass and flatfish on the flooding tide; the windows around peak flood and the first hour of ebb are the traditional casting times. Paddlers and SUP riders launching from the Albertstrand or the Knokke beach time crossings near the Zeebrugge harbour mouth carefully — the harbour entrance carries commercial traffic and strong tidal current — with the slack windows around predicted high and low (about 30 to 45 minutes either side) the operational planning targets. Beach-walking families along the Zeedijk-Heist find the widest dry strand two to three hours either side of predicted low, when several hundred metres of flat sand open up between the dyke and the low-water line. Birdwatchers at Het Zwin time visits for the rising tide, when waders and shorebirds concentrate at the receding mudflat edges as the marsh fills; the spring high tides cover most of the marsh interior and push the bird traffic toward the dyke edges and the upper salt meadow. Photographers shooting the Casino Knokke or the Het Zwin marsh from the dyke get the highest water levels against the seawall and the marsh creeks at predicted high. The predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within plus or minus 45 minutes on timing and within roughly 0.3 metres on height. For a coast with a 4-metre swing, the height uncertainty is small relative to the signal — the rhythm, timing, and approximate height of high and low water are reliable for general planning. The authoritative source for precise operational data is Vlaamse Hydrografie (Flemish Hydrography), part of MDK (Maritieme Dienstverlening en Kust), which operates the regional gauge network including Zeebrugge and Ostend and publishes the official Belgian tide tables.