Porth Trecastell today
- Beach day Not today Not a beach day · 0/10
- Tide now 17.8 ft ↓ falling · low 5:43 am (3.6 ft)
- Best time to fish 6:00–7:00 pm good day · 7/10
- Waves · water 3.5 ft · 56 °F slight · 6.2 s from the southwest
- Wind · air 11 mph · 56 °F from the SW, gusts 17 · overcast
- Sun 7:10 am–4:52 pm 9 h 42 min of daylight
- Moon 85% · 6:27 pm waning gibbous · rises at 6:27 pm
- Best time to dive 11:30 am–1:00 pm good day · 8/10
Today in Porth Trecastell there is high tide at 11:56 am (19.0 ft) and low tides at 5:43 am and 6:12 pm. Tide coefficient 88. Right now the tide is falling toward the low tide at 5:43 am. The sun rises at 7:10 am and sets at 4:52 pm: 9 h 42 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 6:27 pm. Major solunar periods run from 1:44 am to 3:44 am and from 2:16 pm to 4:16 pm. The next spring tides arrive from November 9 to 11. The sea is slight, with 3.5 ft waves. There's a gentle breeze from the southwest (11 mph). Overcast, 56 °F.
Beach day in Porth Trecastell
Is it a beach day?
- Cloudy (91% cloud cover)
- Feels like 52 °F: chilly for the beach
- Moderate cross-shore wind (14 mph)
- Swim with care: 3.0 ft waves every 5 s
- Water at 56 °F (very cold)
- High tide at 11:56 am
Today, hour by hour
- Swimming Use care · 3.0 ft
3.0 ft waves every 5 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.
- Water 56 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 14 mph
Moderate cross-shore wind (14 mph).
- Tide & sand 5:43 am
Low tide at 5:43 am and 6:12 pm: that's when there's the most sand. High tide at 11:56 am.
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
About Porth TrecastellThe beach
In Rhosneigr, 1.8 mi from the center. Tides, weather and sun in Rhosneigr →
- Parking
Amenities from OpenStreetMap: some may be missing or out of date. See on OpenStreetMap · Fix on OpenStreetMap
Beaches near Porth Trecastell
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Porth Nobla 0.4 mi · NW
- Restrooms
- Parking
- Porth China 1.4 mi · S
- Aberffraw Sands 2.4 mi · SE
Excellent water quality 2025 season, Natural Resources Wales
- Traeth Crigyll 2.5 mi · NW
- Restrooms
- Parking
- Porth Cadwaladr 3.1 mi · SE
- Porth-y-Cŵch 3.5 mi · SE
- Traeth Llydan 3.8 mi · NW
- Parking
Excellent water quality 2025 season, Natural Resources Wales
- Porth Twyn-mawr 3.8 mi · SE
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).
UK bathing water quality: Natural Resources Wales. Contains public sector information licensed under the Open Government Licence v3.0. Full attribution.
Webcams near Porth Trecastell
Webcams provided by windy.com — add a webcam
Fishing in Porth Trecastell today
Best time to fish
Solunar activity today: medium- Low tide at 6:12 pm
- Minor period 5:57–6:57 pm (moonrise)
- Steady pressure (30.30 inHg), light cross-shore wind (6 mph) and some swell (3.2 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 88 (average tides)
- A major period lines up with sunset
Your day at a glance
The best window, 6:00 pm to 7:00 pm, combines the 6:12 pm low tide, moonrise and some swell. Also good from 2:30 pm to 4:20 pm, with a major period, sunset, a light onshore breeze and some swell. Also worth a try from 11:40 am to 12:40 pm, with the 11:56 am high tide, moonset and some swell, though with rising pressure and moderate wind.
Species with the most records nearby: European plaice, small-spotted catshark, thornback ray and common sole. October is one of the months when these are seen most: European plaice and common sole. What you can catch
Tides in Porth Trecastell
Today's high and low tides
- ▼ Next low tide 5:43 am 3.6 ft
- ▲ High tide 11:56 am 19.0 ft · coef. 88
- ▼ Low tide 6:12 pm 3.4 ft
↓ Falling The tide is falling. 4 h 53 min to low tide at 5:43 am.
Tide coefficient 88 for the 11:56 am high tide. Average coefficient. The water rises and falls 15.5 ft between the highest high and the lowest low: a large 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 December 26 (20.4 ft) and the lowest, on August 14 (0.7 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 26 to 28 (coefficient 93, 16.4 ft range). The smallest, from October 19 to 20 (coefficient 37, 7.2 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 | 7:10 am · 4:52 pm | Low tide 5:43 am · 3.6 ft | High tide 11:56 am · 19.0 ft | Low tide 6:12 pm · 3.4 ft | — | Coef. 88 | 85% | Major periods 1:44 am · 2:16 pm | Medium |
| Fri 30 | 7:12 am · 4:50 pm | High tide 12:25 am · 18.5 ft | Low tide 6:30 am · 4.3 ft | High tide 12:44 pm · 18.5 ft | Low tide 7:05 pm · 4.1 ft | Coef. 84 | 76% | Major periods 2:49 am · 3:21 pm | Medium |
| Sat 31 | 7:14 am · 4:48 pm | High tide 1:20 am · 17.6 ft | Low tide 7:22 am · 5.3 ft | High tide 1:40 pm · 17.9 ft | Low tide 8:05 pm · 4.9 ft | Coef. 75 | 65% | Major periods 3:52 am · 4:22 pm | Medium |
| Sun 1 | 7:16 am · 4:46 pm | High tide 2:23 am · 16.6 ft | Low tide 8:22 am · 6.3 ft | High tide 2:44 pm · 17.1 ft | Low tide 9:15 pm · 5.6 ft | Coef. 65 | Last quarter | Major periods 4:50 am · 5:18 pm | Medium |
| Mon 2 | 7:18 am · 4:44 pm | High tide 3:38 am · 15.7 ft | Low tide 9:33 am · 7.0 ft | High tide 4:00 pm · 16.5 ft | Low tide 10:33 pm · 5.8 ft | Coef. 56 | 43% | Major periods 5:44 am · 6:09 pm | Medium |
| Tue 3 | 7:20 am · 4:42 pm | High tide 5:03 am · 15.3 ft | Low tide 10:55 am · 7.1 ft | High tide 5:23 pm · 16.3 ft | Low tide 11:52 pm · 5.4 ft | Coef. 54 | 32% | Major periods 6:34 am · 6:57 pm | Medium |
| Wed 4 | 7:22 am · 4:41 pm | High tide 6:22 am · 15.7 ft | Low tide 12:14 pm · 6.6 ft | High tide 6:38 pm · 16.8 ft | — | Coef. 61 | 23% | Major periods 7:20 am · 7:42 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
Porth Trecastell has no station of its own, so we use the tide at Holyhead (Environment Agency), 8.9 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: This uses Environment Agency tide gauge data from the real-time data API (Beta): Holyhead (E70524), https://environment.data.gov.uk/flood-monitoring/id/stations/E70524. Contains public sector information licensed under the Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Modified: harmonic constants fitted by TidePlanet from the 15-minute sea levels of 2025-10-29 to 2026-10-22 (356 days).
The sea at Porth Trecastell
Sea stateSea state: slight
The waves you may find
- Most commonMost common1.8 ft
- Significant3.5 ft
- Highest expectedHighest7.3 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 7.3 ft. Before heading out, expect waves of up to 7.3 ft.
Wind on the coast and offshore
Cross-onshore wind. The coast faces west and the wind comes in from the sea at an angle: a bit more surf at the shore and drift along the coast, toward land.
Wave height, next 7 daysWaves, next 7 days
Waves stay much the same all week. The biggest waves arrive on Friday 30: 3.9 ft with a period of 5 s, from the south-southwest (slight).
Water temperature
Water temperature →Water temperature changes how fish behave: in very cold or very warm water they feed less. The water is steady these days, with no sudden changes.
Water about normal for late October.
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 12:50 am (local time).
Surf in Porth Trecastell today
Surf today
Poor- 1.7–2.6 ft surf at the shore, a fun size for most surfers
- 1.9 ft swell at 5 s from the southwest, short: weak, messy waves
- Light cross-shore wind (9 mph): a bit of chop
- Rising tide (high tide at 11:56 am)
- Light: First light 6:34 am · sunrise 7:10 am · sunset 4:52 pm · last light 5:28 pm
- Tide: low 5:43 am (3.6 ft), high 11:56 am (19.0 ft) and low 6:12 pm (3.4 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 55.9 °F: a 5/4 fullsuit with booties (and a hood if it’s windy).
- Energy: 19 kJ · Low power
Today’s surf at a glance
The best window is 7:00 am to 10:00 am, though with a short-period swell. 11:00 am to 3:00 pm can also work, though with a short-period swell, wind swell and cross-shore wind.
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 Porth Trecastell today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (11:56 am): little current from 11:30 am to 12:20 pm
- 3.0 ft surface waves
- Moderate cross-shore wind (14 mph)
- 0.5 mph current toward the north-northwest, weak (model)
- Sun high: more light underwater
- Slack water today: low tide 5:43 am (5:20–6:00 am), high tide 11:56 am (11:30 am–12:20 pm), low tide 6:12 pm (5:50–6:30 pm) and high tide 12:25 am (11:50 pm–12:50 am)
- Likely visibility: good. Swell (up to 3.9 ft at 7 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 55.9 °F: a 7 mm semi-dry suit, with hood, gloves and booties.
- Snorkeling: doable, with some waves or wind.
- Night dive: dark from 5:28 pm. Waning gibbous (85%), rising at 6:27 pm: a bright night.
Your diving day at a glance
The best window, 11:30 am to 1:00 pm, combines slack water at high tide, weak current and the sun high, though with moderate wind.
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
- Kimya 3.9 mi
- Kimya (part Of) 4.2 mi
- Sapphire 7.1 mi
- Grampian Castle 7.6 mi
- Segontium (sirgontium) 7.8 mi
- Breeze 8.7 mi
- Asmund 8.8 mi
- Town of Wexford 9.5 mi
- Wreck 5.5 mi
- Wreck 5.6 mi
- Wreck 7.1 mi
- Anglesey Divers 8.9 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 Porth Trecastell
Now in Porth Trecastell
- Low / high
- 54 / 57 °F
- Rain
- 0.08 in · 29%
- Clouds
- 90%
- Humidity
- 90%
- Dew pointDew point
- 53 °F
- Visibility
- 13 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 29
- 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: +0.15 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 | Overcast | Overcast | Overcast | Overcast |
| Temperature | 56° | 56° | 55° | 56° | 56° | 56° | 55° | 54° |
| Wind (mph) | 11 SSW | 9 SW | 8 S | 10 S | 14 S | 11 S | 7 SSE | 7 SSE |
| Gusts | 16 | 15 | 13 | 16 | 22 | 19 | 11 | 10 |
| Waves | 3.6 ft | 3.4 ft | 3.1 ft | 2.9 ft | 3.0 ft | 3.0 ft | 3.1 ft | 3.4 ft |
| Rain | 0.01 in | 0.00 in | 0.02 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 12:00 am 56° 11 SSW 3.6 ft
- 3:00 am 56° 9 SW 3.4 ft
- 6:00 am 55° 8 S 3.1 ft
- 9:00 am 56° 10 S 2.9 ft
- 12:00 pm 56° 14 S 3.0 ft
- 3:00 pm 56° 11 S 3.0 ft
- 6:00 pm 55° 7 SSE 3.1 ft
- 9:00 pm 54° 7 SSE 3.4 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 54 / 57 °F | 14 mph S | 3.6 ft | 11:56 am | |
| Fri 30 | 51 / 57 °F | 14 mph SSE | 3.9 ft | 12:25 am · 12:44 pm | |
| Sat 31 | 47 / 57 °F | 5 mph SSE | 2.3 ft | 1:20 am · 1:40 pm | |
| Sun 1 | 51 / 56 °F | 9 mph NNE | 2.4 ft | 2:23 am · 2:44 pm | |
| Mon 2 | 47 / 52 °F | 12 mph ENE | 1.3 ft | 3:38 am · 4:00 pm | |
| Tue 3 | 43 / 53 °F | 9 mph ENE | 0.6 ft | 5:03 am · 5:23 pm | |
| Wed 4 | 43 / 51 °F | 8 mph ENE | 0.5 ft | 6:22 am · 6:38 pm | |
| Thu 5 | 44 / 53 °F | 9 mph ENE | 0.6 ft | 7:23 am · 7:37 pm | |
| Fri 6 | 43 / 50 °F | 9 mph NE | 0.6 ft | 8:11 am · 8:25 pm | |
| Sat 7 | 38 / 48 °F | 6 mph ENE | 0.9 ft | 8:51 am · 9:06 pm | |
| Sun 8 | 45 / 51 °F | 9 mph ENE | 1.1 ft | 9:26 am · 9:42 pm | |
| Mon 9 | 51 / 56 °F | 11 mph SE | 1.2 ft | 9:59 am · 10:17 pm | |
| Tue 10 | 51 / 55 °F | 5 mph E | 0.9 ft | 10:31 am · 10:50 pm | |
| Wed 11 | 52 / 55 °F | 15 mph S | 2.4 ft | 11:04 am · 11:24 pm |
- Fri 30 Overcast 51° / 57° 3.9 ft
- Sat 31 Overcast 47° / 57° 2.3 ft
- Sun 1 Overcast 51° / 56° 2.4 ft
- Mon 2 Overcast 47° / 52° 1.3 ft
- Tue 3 Overcast 43° / 53° 0.6 ft
- Wed 4 Overcast 43° / 51° 0.5 ft
- Thu 5 Mainly clear 44° / 53° 0.6 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, normal highs for late October (55 °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 12:50 am (local time).
The sun in Porth Trecastell
Sunrise and sunset
- First light 5:53 am
- Full dark 6:09 pm
- Civil dawn 6:34 am
- Civil dusk 5:28 pm
- Solar noon 12:02 pm (23° high)
- Daylight 9 h 42 min (−4 min)
- Evening golden hour 4:01 pm
- Full dark 6:09 pm
Golden hour and the day-night map
Today the sun is 92,335,248 mi away and looks 32′ 11″ across.
The moon in Porth Trecastell
Moon phase and position
Today the moon is 226,641 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 1:44–3:44 am Major · the moon passes overhead · high activity
- 2:16–4:16 pm Major · the moon passes underfoot · high activity
- 11:35 am–12:35 pm Minor · moonset · medium activity
- 5:57–6:57 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 · 8:29 pmNov 1 in 3 days
- New moon Mon, Nov 9 · 7:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 11:48 amNov 17 in 19 days
- Full moon Tue, Nov 24 · 2:54 pmNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Porth Trecastell
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetty 5.0 mi
- Jetty 6.5 mi
- Jetty 6.8 mi
- Boat ramp 2.0 mi
- Boat ramp 3.9 mi
- Boat ramp 6.3 mi
- Boat ramp 6.3 mi
- Boat ramp 6.9 mi
- Boat ramp 7.2 mi
- Boat ramp 9.1 mi
- Valley Baits 3.8 mi
- Criccieth Tackle Box 4.4 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 0.25 mi from shore and 33 ft at 0.8 mi.
From the shoreline out to sea, heading southwest.
How far from shore
- 16 ft deep0.25 mi
- 33 ft deep0.8 mi
- 66 ft deep1.6 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 0.25 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.
The profile is turned slightly from the coast so it does not run into an island or a headland.
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
Twr Mawr Llanddwyn Lighthouse 6.0 mi southeast
- Tower height
- 33 ft
Data from Wikidata. For reference only: not for navigation. Wikipedia · Wikidata · Sources and licenses
Tides near Porth TrecastellTides nearby
- Aberffraw1.7 mi
- Rhosneigr1.8 mi
- Malltraeth4.8 mi
- Bodedern5.9 mi
- Valley6.1 mi
- Dwyran7.8 mi
- Holyhead8.8 mi
- Caernarfon10 mi
- Y Felinheli12 mi
- Llanfairpwllgwyngyll12 mi
Porth Trecastell at a glance
- Beach. Coordinates: 53.207° N, 4.498° W.
- It is 8.8 mi southeast of Holyhead, the main place in Anglesey. The sun rises 1 min earlier and sets at the same time than in Holyhead.
- In Rhosneigr, 1.8 mi from the center.
- The nearest tide station, Holyhead, is 8.9 mi to the northwest.
- Its coast faces west.
Questions about Porth TrecastellQuestions
Where is Porth Trecastell?
In Rhosneigr, 1.8 mi from the center, Anglesey (United Kingdom). The shore faces west.
What amenities does Porth Trecastell have?
According to OpenStreetMap: parking. Some may be missing or out of date, so ask at the beach.
What time is high tide today in Porth Trecastell?
Today in Porth Trecastell there is high tide at 11:56 am (19.0 ft) and low tides at 5:43 am and 6:12 pm. Tide coefficient 88.
What time is sunset today in Porth Trecastell?
At 4:52 pm. There is light until the end of civil twilight, at 5:28 pm.
What time is sunrise tomorrow in Porth Trecastell?
At 7:12 am. First light comes at 5:55 am.
What phase is the moon today?
Waning gibbous, 85% illuminated. New moon on Mon, Nov 9 · 7:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 1:44–3:44 am, Minor 11:35 am–12:35 pm, Major 2:16–4:16 pm, Minor 5:57–6:57 pm. Today's activity is medium.
What's the weather like today in Porth Trecastell?
Overcast, from 54 °F to 57 °F, with a gentle breeze from the southwest (11 mph) and a 29% chance of rain.
How is the sea today in Porth Trecastell?
Slight (Douglas 3): 3.5 ft waves with a period of 6.2 s from the southwest. The water is 56.1 °F.
When is the best time to visit Porth Trecastell?
The best time to visit Porth Trecastell is from June to August: highs of 63 °F to 66 °F, about 12 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: Holyhead tide gauge (UK National Tide Gauge Network). This uses Environment Agency tide gauge data from the real-time data API (Beta), under the Open Government Licence v3.0; constants fitted by TidePlanet from a year of its readings. Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).