Grande-Synthe tides today
- Tide now 18.0 ft ↓ falling · low 9:13 am (3.2 ft)
- Best time to fish 2:50–3:40 pm good day · 8/10
- Beach day Not today Not a beach day · 1/10
- Waves · water 1.3 ft · 58 °F smooth · 5.2 s from the west-southwest
- Wind · air 4 mph · 50 °F from the SW, gusts 8 · overcast
- Sun 7:38 am–5:31 pm 9 h 53 min of daylight
- Moon 85% · 7:16 pm waning gibbous · rises at 7:16 pm
- Best time to dive 2:00–3:30 pm great day · 10/10
Today in Grande-Synthe there are high tides at 2:21 am (20.7 ft) and 2:40 pm (20.9 ft) and low tides at 9:13 am and 9:38 pm. Tide coefficient 85. Right now the tide is falling toward the low tide at 9:13 am. The sun rises at 7:38 am and sets at 5:31 pm: 9 h 53 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 7:16 pm. Major solunar periods run from 2:16 am to 4:16 am and from 2:48 pm to 4:48 pm. The next spring tides arrive from November 9 to 11. The sea is smooth, with 1.3 ft waves. There's a light breeze from the southwest (4 mph). Overcast, 50 °F.
Fishing in Grande-Synthe today
Best time to fish
Solunar activity today: medium- High tide at 2:40 pm, coefficient 83
- Major period 2:48–4:48 pm
- Steady pressure (30.39 inHg), almost no wind and calm sea (0.7 ft waves)
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 85 (average tides)
- A major period lines up with sunset
Your day at a glance
The best window, 2:50 pm to 3:40 pm, combines the 2:40 pm high tide and a major period. Also worth a try from 2:20 am to 3:20 am, with the 2:21 am high tide and a major period, though with rising pressure.
Species with the most records nearby: European plaice, European sea bass, whiting and European flounder. October is one of the months when these are seen most: European sea bass. What you can catch
Beach day in Grande-Synthe
Is it a beach day?
- Sun and clouds
- Cross-shore breeze (4 mph)
- Calm for swimming: 0.9 ft waves
- Low tide at 9:13 am: more sand
- Feels like 61 °F: chilly for the beach
- Water at 58 °F (very cold)
Today, hour by hour
- Swimming Calm · 0.9 ft
0.9 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 58 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 4 mph
Cross-shore breeze (4 mph).
- Tide & sand 9:13 am
Low tide at 9:13 am and 9:38 pm: that's when there's the most sand. High tide at 2:21 am and 2:40 pm.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority. How it works · The next 7 days
Beaches near Grande-Synthe
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Plage du Braek 2.5 mi · N
- Parking
- Plage de Malo-les-Bains 5.1 mi · NE
- Lifeguard
- Restrooms
- Showers
- Parking
Good water quality 2025 season, EEA
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL). Bathing water quality: European Environment Agency (EEA), with data from the French Ministry of Health (baignades.sante.gouv.fr).
Webcams near Grande-Synthe
Webcams provided by windy.com — add a webcam
Tides in Grande-Synthe
Today's high and low tides
- ▲ High tide 2:21 am 20.7 ft · coef. 85
- ▼ Next low tide 9:13 am 3.2 ft
- ▲ High tide 2:40 pm 20.9 ft · coef. 83
- ▼ Low tide 9:38 pm 3.2 ft
↓ Falling The tide is falling. 5 h 23 min to low tide at 9:13 am.
Tide coefficient 85 for the 2:21 am high tide and 83 for the 2:40 pm high tide. Average coefficient. The water rises and falls 17.7 ft between the highest high and the lowest low: an average range for this place. 70 is an average tide here; 90 and above means spring tides; below 45, neap tides. What is the tide coefficient?
2026 extremes: the highest tide of the year is on March 22 (21.3 ft) and the lowest, on March 21 (1.0 ft).
Semidiurnal: two high and two low tides a day, of similar height.
Heights above chart datum: the lowest astronomical tide (LAT), the zero of nautical charts in Europe. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. chart datum (LAT)
Tide coefficient and range in October
The biggest tides of the month came from October 10 to 12 (coefficient 90, 19.1 ft range). The smallest, on October 20 (coefficient 38, 8.0 ft).
Tide and solunar table · this week
| Day | Sun | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|---|---|
| Today, Thu 29 | 7:38 am · 5:31 pm | High tide 2:21 am · 20.7 ft | Low tide 9:13 am · 3.2 ft | High tide 2:40 pm · 20.9 ft | Low tide 9:38 pm · 3.2 ft | Coef. 85 | 85% | Major periods 2:16 am · 2:48 pm | Medium |
| Fri 30 | 7:39 am · 5:29 pm | High tide 3:04 am · 20.1 ft | Low tide 10:01 am · 3.7 ft | High tide 3:24 pm · 20.3 ft | Low tide 10:26 pm · 4.0 ft | Coef. 81 | 76% | Major periods 3:20 am · 3:52 pm | Medium |
| Sat 31 | 7:41 am · 5:27 pm | High tide 3:51 am · 19.3 ft | Low tide 10:52 am · 4.2 ft | High tide 4:13 pm · 19.3 ft | Low tide 11:21 pm · 4.9 ft | Coef. 74 | 66% | Major periods 4:23 am · 4:53 pm | Medium |
| Sun 1 | 7:43 am · 5:25 pm | High tide 4:44 am · 18.2 ft | Low tide 11:52 am · 4.8 ft | High tide 5:12 pm · 18.0 ft | — | Coef. 65 | Last quarter | Major periods 5:22 am · 5:50 pm | Medium |
| Mon 2 | 7:45 am · 5:23 pm | Low tide 12:25 am · 5.7 ft | High tide 5:49 am · 17.0 ft | Low tide 1:01 pm · 5.3 ft | High tide 6:31 pm · 16.9 ft | Coef. 56 | 43% | Major periods 6:16 am · 6:41 pm | Medium |
| Tue 3 | 7:46 am · 5:22 pm | Low tide 1:39 am · 6.2 ft | High tide 7:17 am · 16.4 ft | Low tide 2:15 pm · 5.2 ft | High tide 8:24 pm · 16.8 ft | Coef. 54 | 33% | Major periods 7:06 am · 7:29 pm | Medium |
| Wed 4 | 7:48 am · 5:20 pm | Low tide 2:56 am · 6.0 ft | High tide 8:47 am · 16.9 ft | Low tide 3:28 pm · 4.5 ft | High tide 9:41 pm · 17.7 ft | Coef. 61 | 23% | Major periods 7:52 am · 8:14 pm | Medium |
▲ high tide · ▼ low tide · heights above chart datum (LAT). Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Where this tide comes from
Grande-Synthe has no station of its own, so we use the tide at Dunkerque (TICON-4), 3.7 mi away. On the open coast the difference is usually a few minutes and inches; inside estuaries, rivers and enclosed bays it can be much larger.
Station data attribution: Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data
The sea at Grande-Synthe
Sea stateSea state: smooth
The waves you may find
- Most commonMost common0.7 ft
- Significant1.3 ft
- Highest expectedHighest2.7 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 2.7 ft. Before heading out, expect waves of up to 2.7 ft.
Wind on the coast and offshore
Cross-offshore wind. The coast faces north and the wind comes off the land at an angle: calmer water near the shore, and bait and boats drift out to sea.
Wave height, next 7 daysWaves, next 7 days
Waves build over the next few days. The biggest waves arrive on Monday 2: 6.6 ft with a period of 6 s, from the north-northeast (moderate).
Water temperature
Water temperature →Water temperature changes how fish behave: in very cold or very warm water they feed less. The water cools over the next few days: about 55.9 °F by Wednesday 4.
Satellite: NASA MUR (JPL MUR MEaSUREs, PO.DAAC), doi:10.5067/GHGMR-4FJ04. Sources and licenses
Water temperature →Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 3:50 am (local time).
Nearest buoy
This is a real measurement of the sea, not a forecast. Data from Agency for Maritime Services and Coast, Department Coast (MDK), via the E.U. Copernicus Marine Service. Generated using E.U. Copernicus Marine Service Information (doi:10.48670/moi-00036).
Surf in Grande-Synthe today
Surf today
Flat- Barely any waves (0.6 ft sets): flat
- Almost no wind (3 mph): glassy water
- First or last light of the day
- Falling tide (low tide at 9:13 am)
It’s flat today: almost no waves reach this coast.
- Light: First light 7:03 am · sunrise 7:38 am · sunset 5:31 pm · last light 6:05 pm
- Tide: high 2:21 am (20.7 ft), low 9:13 am (3.2 ft), high 2:40 pm (20.9 ft) and low 9:38 pm (3.2 ft). Every break has its own tide: some work at low tide and others at high tide. The tide doesn’t change the score here.
- Water at 57.6 °F: a 4/3 fullsuit (booties if you run cold).
- Energy: 2 kJ · Low power
Today’s surf at a glance
The best window, 7:03 am to 11:00 am, has glassy water, though with barely any waves.
An estimate for this stretch of coast, not for a specific break: every beach or reef works its own way (its tide, bottom and angle). Check it when you get there.
Follow the flags and the lifeguards, and don’t paddle out if the surf is above your level: this score is a guide, not a substitute for what you see when you get there.
Diving in Grande-Synthe today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (2:40 pm): little current from 2:25 pm to 3:00 pm
- 0.5 ft swell at 5 s from the west-southwest: barely any surge
- Almost no wind
- 0.0 mph current toward the east, weak (model)
- Sun high: more light underwater
- Slack water today: high tide 2:21 am (2:06–2:40 am), low tide 9:13 am (8:40–9:40 am), high tide 2:40 pm (2:25–3:00 pm) and low tide 9:38 pm (9:00–10:10 pm)
- Likely visibility: good. The sea has been calm and there's been little rain. Based on the last 24 hours of data.
- Water at 57.6 °F: a 7 mm wetsuit, with hood and booties.
- Snorkeling: good, calm sea and light wind.
- Night dive: dark from 6:05 pm. Waning gibbous (85%), rising at 7:16 pm: a bright night.
Your diving day at a glance
The best window, 2:00 pm to 3:30 pm, combines slack water at high tide, little swell, light wind, weak current and the sun high. Also good from 8:10 am to 10:20 am, with slack water at low tide, little swell, light wind and weak current.
Slack water comes from the tide: in inlets, channels and between islands the water can keep running for an hour or two after. Ask the local dive shop.
Never dive alone and check with the local dive shop: this rating is a guide, not a substitute for a professional.
Dive sites, wrecks and dive shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- HMS Grenade 3.5 mi
- R.93 3.7 mi
- Ganko 3.7 mi
- Fennella 3.9 mi
- HMS King Orry 4.0 mi
- Wreck 3.2 mi
- Banc des Flandres 12 mi
- Elite Diving - School Diving Sous-marine À Dunkerque And Sale Equipment Plongée 0.3 mi
- Plongée les épaves de l'opération dynamo 2.6 mi
- Forme 4 3.6 mi
- Dunkerque Plongée Cpesmde 3.6 mi
- Discovery Plongee 4.1 mi
Within 12 mi. Some may be missing or closed; marine reserves usually need a permit. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Wreck and reef positions are approximate and not for navigation; a wreck’s depth runs from the top of the hull to the seabed.
Sites: © OpenStreetMap contributors (ODbL). Wrecks: EMODnet Human Activities (AND-International), from UK Hydrographic Office data, CC BY 4.0. Contains public sector information licensed under the Open Government Licence v3.0.
Weather in Grande-Synthe
Now in Grande-Synthe
- Low / high
- 49 / 61 °F
- Rain
- 0.00 in · 0%
- Clouds
- 100%
- Humidity
- 96%
- Dew pointDew point
- 49 °F
- Visibility
- 11 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 30
- Saharan dust
- No
- Pollen
- None
Pressure and fishing
- ↗ RisingRising Anglers say fish bite less for a while
- → SteadySteady · now Anglers expect normal activity
- ↘ FallingFalling Anglers say fish feed more before the change
Steady now (−0.01 inHg in 3 hours). Over the next 48 hours: +0.09 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.
Today, hour by hourHour by hour
Bars: mean wind. Dashed line: gusts. Arrows point where the wind blows to.
| Time | 12:00 am | 3:00 am | 6:00 am | 9:00 am | 12:00 pm | 3:00 pm | 6:00 pm | 9:00 pm |
|---|---|---|---|---|---|---|---|---|
| Sky | Overcast | Overcast | Overcast | Partly cloudy | Mainly clear | Partly cloudy | Clear | Mainly clear |
| Temperature | 52° | 50° | 50° | 51° | 59° | 61° | 57° | 52° |
| Wind (mph) | 6 SSW | 5 WSW | 4 S | 2 S | 2 S | 2 ENE | 5 ENE | 6 E |
| Gusts | 11 | 9 | 5 | 5 | 6 | 6 | 9 | 10 |
| Waves | 1.7 ft | 1.4 ft | 1.1 ft | 0.9 ft | 0.8 ft | 0.7 ft | 0.6 ft | 0.5 ft |
| Rain | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 3:00 am 50° 5 WSW 1.4 ft
- 6:00 am 50° 4 S 1.1 ft
- 9:00 am 51° 2 S 0.9 ft
- 12:00 pm 59° 2 S 0.8 ft
- 3:00 pm 61° 2 ENE 0.7 ft
- 6:00 pm 57° 5 ENE 0.6 ft
- 9:00 pm 52° 6 E 0.5 ft
- 12:00 am 48° 5 E 0.6 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 49 / 61 °F | 6 mph SE | 1.7 ft | 2:21 am · 2:40 pm | |
| Fri 30 | 41 / 58 °F | 11 mph E | 1.6 ft | 3:04 am · 3:24 pm | |
| Sat 31 | 46 / 51 °F | 9 mph E | 1.5 ft | 3:51 am · 4:13 pm | |
| Sun 1 | 45 / 55 °F | 6 mph N | 3.5 ft | 4:44 am · 5:12 pm | |
| Mon 2 | 52 / 56 °F | 17 mph NNE | 6.6 ft | 5:49 am · 6:31 pm | |
| Tue 3 | 49 / 54 °F | 15 mph ENE | 6.4 ft | 7:17 am · 8:24 pm | |
| Wed 4 | 44 / 51 °F | 10 mph E | 4.6 ft | 8:47 am · 9:41 pm | |
| Thu 5 | 40 / 50 °F | 11 mph E | 2.8 ft | 9:54 am · 10:38 pm | |
| Fri 6 | 39 / 50 °F | 11 mph E | 2.8 ft | 10:48 am · 11:24 pm | |
| Sat 7 | 36 / 47 °F | 8 mph ESE | 3.1 ft | 11:33 am | |
| Sun 8 | 43 / 56 °F | 7 mph SSE | 1.3 ft | 12:03 am · 12:13 pm | |
| Mon 9 | 50 / 59 °F | 11 mph SSE | 1.6 ft | 12:37 am · 12:48 pm | |
| Tue 10 | 52 / 60 °F | 14 mph SSW | 4.5 ft | 1:06 am · 1:19 pm | |
| Wed 11 | 52 / 60 °F | 18 mph SSW | 4.7 ft | 1:33 am · 1:50 pm |
- Fri 30 Mainly clear 41° / 58° 1.6 ft
- Sat 31 Overcast 46° / 51° 1.5 ft
- Sun 1 Overcast 45° / 55° 3.5 ft
- Mon 2 Light drizzle 52° / 56° 6.6 ft
- Tue 3 Light drizzle 49° / 54° 6.4 ft
- Wed 4 Light drizzle 44° / 51° 4.6 ft
- Thu 5 Clear sky 40° / 50° 2.8 ft
Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.
- Normal Today, warmer than normal for late October (+3.9 °F; normal high: 57 °F). Climate by month →
Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 3:50 am (local time).
The sun in Grande-Synthe
Sunrise and sunset
- First light 6:24 am
- Full dark 6:44 pm
- Civil dawn 7:03 am
- Civil dusk 6:05 pm
- Solar noon 12:35 pm (25° high)
- Daylight 9 h 53 min (−4 min)
- Evening golden hour 4:42 pm
- Full dark 6:44 pm
Golden hour and the day-night map
Today the sun is 92,335,704 mi away and looks 32′ 11″ across.
The moon in Grande-Synthe
Moon phase and position
Today the moon is 226,618 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 2:16–4:16 am Major · the moon passes overhead · high activity
- 2:48–4:48 pm Major · the moon passes underfoot · high activity
- 11:50 am–12:50 pm Minor · moonset · medium activity
- 6:46–7:46 pm Minor · moonrise · medium activity
According to solunar theory, fish feed more when the moon passes overhead or underfoot (major periods, about 2 h) and when it rises or sets (minor periods, 1 h). It works best around new and full moon.
Upcoming moon phases
2026 moon calendar →- Last quarter Sun, Nov 1 · 9:29 pmNov 1 in 3 days
- New moon Mon, Nov 9 · 8:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 12:48 pmNov 17 in 19 days
- Full moon Tue, Nov 24 · 3:54 pmNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Grande-Synthe
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetée de Saint-Pol 3.6 mi
- Quai d'Alsace 4.9 mi
- Jetty 4.7 mi
- Au Domaine de la Koï 7.6 mi
- Boat ramp 3.7 mi
- Boat ramp 3.9 mi
- Boat ramp 5.6 mi
- Bassin Maritime 2.2 mi
- Bassin Maritime de Mardyck 2.2 mi
- Port de Dunkerque 2.5 mi
- Littoral Pêche 4.8 mi
- Aux poissons berguois 6.0 mi
Within 9.3 mi. A spot may be missing or closed. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Spots: © OpenStreetMap contributors (ODbL) and Overture Maps.
Water depth
Gentle slopeThe bottom slopes gently: 16 ft deep 0.7 mi from shore and 33 ft at 0.8 mi.
From the shoreline (2.3 mi from Grande-Synthe) out to sea, heading north.
How far from shore
- 16 ft deep0.7 mi
- 33 ft deep0.8 mi
- 66 ft deep2.2 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 0.7 mi): cast far from the beach and fish the high tide, when there is more water close in.
- Swimming. A very gentle way in with plenty of shallow water, good for kids. At low tide the water can be far out.
- Diving. Shallow near shore: you only reach 33 ft at 0.8 mi. For dives deeper than 33 ft, go by boat.
Source: EMODnet Bathymetry DTM 2024 (CC BY 4.0), cells of about 380 ft; depth at the lowest astronomical tide. For reference only: not for navigation or anchoring.
Nearest lighthouse
Dunkirk lighthouse 3.6 mi northeast
- Light
- 2 white flashes every 10 s · Fl(2) W 10s
- Range
- 26 nautical miles (30 mi)
- Light height
- 194 ft above sea level
- Tower height
- 207 ft
- Built
- 1842
Other lighthouses nearby: Feu de Saint-Pol (3.8 mi northeast), Tour du Leughenaer à Dunkerque (3.8 mi northeast).
Light details: NGA List of Lights (USA); the rest from Wikidata. For reference only: not for navigation. Wikipedia · Wikidata · Sources and licenses
Tides near Grande-SyntheTides nearby
- Fort-Mardyck1.0 mi
- Saint-Pol-sur-Mer2.1 mi
- Dunkirk3.6 mi
- Loon-Plage3.8 mi
- Coudekerque-Branche4.1 mi
- Gravelines7.7 mi
- Grand-Fort-Philippe8.4 mi
- Zuydcoote9.0 mi
- Bray-Dunes10 mi
- Oye-Plage11 mi
Grande-Synthe at a glance
- Town or city of about 23,213 people. Coordinates: 51.015° N, 2.300° E.
- It is 3.6 mi west of Dunkirk, the main place in Hauts-de-France. The sun rises at the same time and sets at the same time than in Dunkirk.
- The nearest tide station, Dunkerque, is 3.7 mi to the northeast.
- Its coast faces north.
- Beaches and harbors nearby: Quai de l'Escaut (1.9 mi), Bassin de Mardyck (2.1 mi), Quai de Grande-Synthe (2.1 mi), Quai Usinor (2.6 mi).
Questions about Grande-SyntheQuestions
What time is high tide today in Grande-Synthe?
Today in Grande-Synthe there are high tides at 2:21 am (20.7 ft) and 2:40 pm (20.9 ft) and low tides at 9:13 am and 9:38 pm. Tide coefficient 85.
What time is sunset today in Grande-Synthe?
At 5:31 pm. There is light until the end of civil twilight, at 6:05 pm.
What time is sunrise tomorrow in Grande-Synthe?
At 7:39 am. First light comes at 6:26 am.
What phase is the moon today?
Waning gibbous, 85% illuminated. New moon on Mon, Nov 9 · 8:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 2:16–4:16 am, Minor 11:50 am–12:50 pm, Major 2:48–4:48 pm, Minor 6:46–7:46 pm. Today's activity is medium.
What's the weather like today in Grande-Synthe?
Overcast, from 49 °F to 61 °F, with a light breeze from the southwest (4 mph) and a 0% chance of rain.
How is the sea today in Grande-Synthe?
Smooth (Douglas 2): 1.3 ft waves with a period of 5.2 s from the west-southwest. The water is 57.6 °F.
When is the best time to visit Grande-Synthe?
The best time to visit Grande-Synthe is from July to August: highs of 72 °F, about 9 rainy days a month and 6 hours of sunshine a day.
Can I use this data for navigation?
No. These are predictions for fishing and leisure; for navigation, use the official publications.
Where this data comes from
Tide: Dunkerque station, with constants from TICON-4 (Hart-Davis, Dettmering and Seitz, 2025, SEANOE), licensed CC BY 4.0, via Slackwater database (changes). Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).