TidePlanet
Official alerts:
  • High Wave Advisory (波浪注意報) · Kamogawa City: waves up to 9.8 ft, take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 9:53 am · Public Data License 1.0
    Official text

    Japanese

    千葉県波浪警報・注意報

    北東部、南部では、高波に注意してください。
    鴨川市:波浪注意報(発表)
    波高:3メートル

    出典:気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.

  • Gale Advisory (強風注意報) · Kamogawa City: winds up to 29 mph on land and 34 mph at sea, take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 9:53 am · Public Data License 1.0
    Official text

    Japanese

    千葉県暴風(雪)警報・注意報

    北東部、南部では、強風に注意してください。
    鴨川市:強風注意報(発表)
    陸上 最大風速:13メートル
    海上 最大風速:15メートル

    出典:気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.

  • Thunderstorm Advisory (雷注意報) · Kamogawa City: take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 9:53 am · Public Data License 1.0
    Official text

    Japanese

    千葉県雷注意報

    千葉県では、竜巻などの激しい突風や急な強い雨、落雷に注意してください。
    鴨川市:雷注意報(竜巻、ひょう)(発表)

    出典:気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.

Today in Kamogawa there are high tides at 6:50 am (4.9 ft) and 5:24 pm (5.4 ft) and low tide at 11:54 am. Tide coefficient 97. Right now the tide is rising toward the high tide at 5:24 pm. The sun rises at 5:57 am and sets at 4:49 pm: 10 h 51 min of daylight. The moon is 88% illuminated (waning gibbous) and rises at 6:59 pm. Major solunar periods run from 12:40 am to 2:40 am and from 1:12 pm to 3:12 pm. The next spring tides arrive from October 27 to 29. The sea is slight, with 3.0 ft waves. There's a light air from the north-northeast (3 mph). Light drizzle, 61 °F.

Fishing

Fishing in Kamogawa today

Fishing forecast, 7 days →

Best time to fish

Solunar activity today: medium
6
Average day · 6 out of 10 5:50–6:30 am Also 4:20–5:10 pm
  • High tide at 6:50 am, coefficient 97
  • Sunrise at 5:57 am
  • Rising pressure (+0.47 inHg in 24 h), light cross-shore wind (5 mph) and some swell (2.7 ft waves) to stir the water
  • Waning gibbous: a bit more activity than at the quarters
  • Highest tide coefficient today: 97 (spring tides)

Your day at a glance

The best window, 5:50 am to 6:30 am, combines the 6:50 am high tide, sunrise and some swell, though with rising pressure. Also worth a try from 4:20 pm to 5:10 pm, with the 5:24 pm high tide, sunset and some swell, though with rising pressure.

Species with the most records nearby: striped mullet, Japanese amberjack, mahi-mahi and greater amberjack. What you can catch

How it works · Next 7 days · Fishing rules

Beach

Beach day in Kamogawa

Beach forecast, 7 days →

Is it a beach day?

0
Not a beach day · 0 out of 10 No good beach time today.
  • Offshore breeze (5 mph)
  • Water at 75 °F (warm)
  • Low tide at 11:54 am: more sand
  • Cloudy (83% cloud cover)
  • Feels like 67 °F: a bit cool
  • Rain (0.05 in)

Today, hour by hour

  • Swimming Use care · 3.0 ft

    3.0 ft waves every 7 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.

  • Water 75 °F

    Warm: very pleasant.

  • Sun & sunscreen UV 3 · SPF 15

    Max UV 3 (low): SPF 15 sunscreen.

  • Wind 5 mph

    Offshore breeze (5 mph).

  • Tide & sand 11:54 am

    Low tide at 11:54 am: that's when there's the most sand. High tide at 6:50 am and 5:24 pm. Coefficient 97 (spring tides): little sand left at high tide.

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 Kamogawa

We don't know of any named beaches within 6.2 mi of Kamogawa.

Missing one? Beaches come from OpenStreetMap: you can add it there. Add or fix on OpenStreetMap

Beaches and amenities: © OpenStreetMap contributors (ODbL).

Tides

Tides in Kamogawa

Tides for 7 days →

Today's high and low tides

  • ▲ High tide 6:50 am 4.9 ft · coef. 97
  • ▼ Low tide 11:54 am 3.1 ft

↑ Rising The tide is rising. 5 h 11 min to high tide at 5:24 pm.

Tide coefficient 97 for the 6:50 am high tide and 92 for the 5:24 pm high tide. Spring tides. The water rises and falls 2.3 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 October 28 (5.4 ft) and the lowest, on May 18 (-0.6 ft).

Mixed: two high and two low tides a day, but of quite different heights.

Heights above NLLW. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. NLLW

Tide coefficient and range in October

The biggest tides of the month came from October 26 to 27 (coefficient 109, 5.3 ft range). The smallest, on October 19 (coefficient 24, 2.3 ft).

Tide and solunar table · this week

Day Sun Tide 1Tide 2Tide 3Tide 4 Coef. Moon Major periods Activity
Today, Thu 29 5:57 am · 4:49 pm High tide 6:50 am · 4.9 ft Low tide 11:54 am · 3.1 ft High tide 5:24 pm · 5.4 ft — Coef. 97 88% Major periods 12:40 am · 1:12 pm Medium
Fri 30 5:58 am · 4:48 pm Low tide 12:39 am · 0.1 ft High tide 7:44 am · 4.6 ft Low tide 12:28 pm · 3.3 ft High tide 5:58 pm · 5.2 ft Coef. 83 80% Major periods 1:44 am · 2:17 pm Medium
Sat 31 5:59 am · 4:47 pm Low tide 1:30 am · 0.4 ft High tide 8:46 am · 4.3 ft Low tide 1:06 pm · 3.5 ft High tide 6:36 pm · 4.9 ft Coef. 67 69% Major periods 2:48 am · 3:19 pm Medium
Sun 1 6:00 am · 4:46 pm Low tide 2:28 am · 0.8 ft High tide 10:04 am · 4.1 ft Low tide 2:06 pm · 3.7 ft High tide 7:28 pm · 4.4 ft Coef. 50 58% Major periods 3:49 am · 4:18 pm Medium
Mon 2 6:01 am · 4:45 pm Low tide 3:40 am · 1.3 ft High tide 11:37 am · 4.0 ft Low tide 4:25 pm · 3.6 ft High tide 9:11 pm · 4.0 ft Coef. 39 Last quarter Major periods 4:45 am · 5:11 pm Medium
Tue 3 6:02 am · 4:44 pm Low tide 5:01 am · 1.6 ft High tide 12:43 pm · 4.1 ft Low tide 6:37 pm · 3.1 ft High tide 11:41 pm · 3.9 ft Coef. 44 36% Major periods 5:36 am · 6:00 pm Medium
Wed 4 6:03 am · 4:43 pm Low tide 6:18 am · 1.9 ft High tide 1:23 pm · 4.3 ft Low tide 7:36 pm · 2.5 ft — Coef. 51 26% Major periods 6:23 am · 6:46 pm Medium

▲ high tide · ▼ low tide · heights above NLLW. Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.

Where this tide comes from

B · Nearby station

Kamogawa has no station of its own, so we use the tide at Katsuura (TICON-4), 8.7 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

How we calculate the tide

Sea and waves

The sea at Kamogawa

7-day waves

Sea stateSea state: slight

Slight Douglas 3 · light breeze, Beaufort 2
Waves 3.0 ft · 6.5 s from the east-southeast (112°)
Swell 2.2 ft · 4.6 s from the east
Current 0.6 mph toward the WSW

The waves you may find

  • Most commonMost common1.5 ft
  • Significant3.0 ft
  • Highest expectedHighest6.2 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 6.2 ft. Before heading out, expect waves of up to 6.2 ft.

Wind on the coast and offshore

On the coast 3 mph NNE · gusts 13
Offshore (8.8 mi SW)Offshore 5 mph ESE · gusts 15

Cross-offshore wind. The coast faces southeast and the wind comes off the land at an angle: calmer water near the shore, and bait and boats drift out to sea.

Cross-offshore Hourly wind →

Wave height, next 7 daysWaves, next 7 days

Waves build over the next few days. The biggest waves arrive on Friday 30: 6.4 ft with a period of 8 s, from the southeast (moderate).

Water temperature

Water temperature →
Water now75.4 °F
Today 75.4–75.6 °F air: 48 / 66 °F
Satellite (2 days ago) 73.4 °F measured 0.6 mi away

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 74.2 °F by Wednesday 4.

Water warmer than normal for late October (+3.0 °F).

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 12:13 pm (local time).

Surf

Surf in Kamogawa today

Surf hour by hour and 7 days →

Surf today

Poor
2
Poor · 2 out of 10 12:00–4:00 pm 1.4–2.2 ft
  • 1.4–2.2 ft surf at the shore, a fun size for most surfers
  • 2.1 ft swell at 5 s from the east-southeast, short: weak, messy waves
  • Almost no wind (2 mph): glassy water
  • Rising tide (high tide at 5:24 pm)
Surf at the shore 1.4–2.2 ft average – sets
Swell 2.1 ft 5 s · ESE · 17 kJ
Wind 2 mph NE · calm
Water and wetsuit 75.4 °F Boardshorts
  • Light: First light 5:31 am · sunrise 5:57 am · sunset 4:49 pm · last light 5:15 pm
  • Tide: high 6:50 am (4.9 ft), low 11:54 am (3.1 ft) and high 5:24 pm (5.4 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 75.4 °F: boardshorts or a swimsuit and a rash guard.
  • Energy: 17 kJ · Low power

Today’s surf at a glance

The best window, 12:00 pm to 4:00 pm, has glassy water, though with a short-period swell.

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.

How it’s calculated · Next 7 days

Diving

Diving in Kamogawa today

Diving and snorkeling, 7 days →

Diving and snorkeling today

Likely visibility: good
9
Great day · 9 out of 10 11:10 am–1:10 pm Also 6:00–7:50 am
  • Slack water around low tide (11:54 am): little current from 11:20 am to 12:20 pm
  • 2.2 ft swell at 5 s from the east: some surge on the bottom
  • Light offshore wind (4 mph)
  • 0.6 mph current toward the west-southwest (model)
  • Sun high: more light underwater
Swell 2.2 ft 5 s · from the E
Likely visibility Good Snorkeling: fair
Water and suit 75.4 °F 3 mm wetsuit
Current 0.6 mph toward the WSW
  • Slack water today: low tide 11:54 pm (11:39 pm–12:10 am), high tide 6:50 am (6:30–7:10 am), low tide 11:54 am (11:20 am–12:20 pm) and high tide 5:24 pm (5:00–5:40 pm)
  • Likely visibility: good. Swell (up to 2.7 ft at 6 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
  • Water at 75.4 °F: a 3 mm wetsuit.
  • Snorkeling: doable, with some waves or wind.
  • Night dive: dark from 5:15 pm. Waning gibbous (88%), rising at 6:59 pm: a bright night.

Your diving day at a glance

The best window, 11:10 am to 1:10 pm, combines slack water at low tide, light wind and the sun high, though with current. Also worth a look from 6:00 am to 7:50 am, with slack water at high tide and light wind, though with 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.

How it works · Next 7 days

Dive sites, wrecks and dive shops nearby

Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors

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

Sites: © OpenStreetMap contributors (ODbL).

Weather

Weather in Kamogawa

14-day weather

Now in Kamogawa

Now 61 °F Light drizzle · feels like 61 °F · 48 / 66 °F
Low / high
48 / 66 °F
Rain
0.05 in · 78%
Clouds
83%
Humidity
76%
Dew pointDew point
54 °F
Visibility
6.9 mi
UV indexUV
2 · low
Air qualityAir
Fair · 36
Saharan dust
No

Pressure and fishing

  • ↗ RisingRising Anglers say fish bite less for a while
  • → SteadySteady Anglers expect normal activity
  • ↘ FallingFalling · now Anglers say fish feed more before the change

Falling now (−0.04 inHg in 3 hours). Over the next 48 hours: −0.46 inHg. Falling pressure: anglers say fish feed more before the change. 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 am3:00 am6:00 am9:00 am12:00 pm3:00 pm6:00 pm9:00 pm
Sky Partly cloudyMainly clearMainly clearOvercastLight drizzleLight drizzleClearOvercast
Temperature 53°50°48°58°61°66°57°55°
Wind (mph) 6 ENE7 NE5 NE5 N4 NNE3 S3 WNW4 SE
Gusts 11121314121457
Waves 2.8 ft2.8 ft2.7 ft3.0 ft3.0 ft2.9 ft2.8 ft2.9 ft
Rain 0.00 in0.00 in0.00 in0.00 in0.00 in0.01 in0.00 in0.00 in
  • 12:00 pm 61° 4 NNE 3.0 ft
  • 3:00 pm 66° 3 S 2.9 ft
  • 6:00 pm 57° 3 WNW 2.8 ft
  • 9:00 pm 55° 4 SE 2.9 ft
  • 12:00 am 57° 1 NE 3.2 ft
  • 3:00 am 56° 2 N 4.3 ft
  • 6:00 am 56° 5 ESE 5.2 ft
  • 9:00 am 65° 4 SSW 5.9 ft

Next 14 daysComing days

Day Sky Low / high Max wind Max wave High tides
Today · 29 Light drizzle 48 / 66 °F 6 mph NE 3.1 ft 6:50 am · 5:24 pm
Fri 30 Heavy drizzle 56 / 70 °F 10 mph S 6.4 ft 7:44 am · 5:58 pm
Sat 31 Partly cloudy 56 / 72 °F 12 mph W 5.8 ft 8:46 am · 6:36 pm
Sun 1 Overcast 52 / 67 °F 6 mph ENE 5.1 ft 10:04 am · 7:28 pm
Mon 2 Light rain 53 / 70 °F 19 mph SW 6.0 ft 11:37 am · 9:11 pm
Tue 3 Drizzle 56 / 72 °F 10 mph NE 5.7 ft 12:43 pm · 11:41 pm
Wed 4 Light drizzle 55 / 61 °F 10 mph NNE 5.8 ft 1:23 pm
Thu 5 Light drizzle 55 / 62 °F 12 mph N 6.0 ft 1:19 am · 1:53 pm
Fri 6 Overcast 54 / 69 °F 9 mph NNE 4.7 ft 2:26 am · 2:20 pm
Sat 7 Overcast 52 / 60 °F 9 mph NE 4.6 ft 3:18 am · 2:46 pm
Sun 8 Light drizzle 48 / 57 °F 6 mph NNE — 4:04 am · 3:12 pm
Mon 9 Overcast 47 / 56 °F 11 mph NE — 4:46 am · 3:37 pm
Tue 10 Partly cloudy 45 / 61 °F 6 mph NNE — 5:26 am · 4:02 pm
Wed 11 Partly cloudy 45 / 61 °F 6 mph NE — 6:04 am · 4:27 pm
  • Fri 30 Heavy drizzle 56° / 70° 6.4 ft
  • Sat 31 Partly cloudy 56° / 72° 5.8 ft
  • Sun 1 Overcast 52° / 67° 5.1 ft
  • Mon 2 Light rain 53° / 70° 6.0 ft
  • Tue 3 Drizzle 56° / 72° 5.7 ft
  • Wed 4 Light drizzle 55° / 61° 5.8 ft
  • Thu 5 Light drizzle 55° / 62° 6.0 ft
See all 14 days →

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.

  • The models They don't agree · low confidence: unsure about rain tomorrow. See the models →
  • Normal Today, cooler than normal for late October (−3.2 °F; normal high: 69 °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 12:13 pm (local time).

Sun

The sun in Kamogawa

Sunrise and sunset →

Sunrise and sunset

Rises 5:57 am in the ESE (106°)ESE
Sets 4:49 pm in the WSW (254°)WSW
  • First light 5:02 am
  • Full dark 5:45 pm
  • Civil dawn 5:31 am
  • Civil dusk 5:15 pm
  • Solar noon 11:23 am (42° high)
  • Daylight 10 h 51 min (−2 min)
  • Evening golden hour 4:14 pm
  • Full dark 5:45 pm

Golden hour and the day-night map

Morning golden hour5:57–6:33 am
Evening golden hour4:14–4:49 pm
Kamogawa

Today the sun is 92,344,977 mi away and looks 32′ 11″ across.

Moon and solunar

The moon in Kamogawa

The moon for 7 days →

Moon phase and position

Waning gibbous · 88% 88% illuminated · 18.5 days old New moon on Mon, Nov 9 · 4:03 pm
Rises 6:59 pm in the NE (56°)NE
Sets 10:30 am tomorrow · in the NW (304°) · set at 9:24 am
Transit 1:40 am overhead
Visible 15 h 31 min from 6:59 pm to 10:30 am

Today the moon is 226,480 mi away and looks 32′ 46″ across.

Solunar periods

Today's activity: medium
  • 12:40–2:40 am Major · the moon passes overhead · high activity
  • 1:12–3:12 pm Major · the moon passes underfoot · high activity
  • 8:54–9:54 am Minor · moonset · medium activity
  • 6:29–7:29 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 Mon, Nov 2 · 5:29 amNov 2 in 4 days
  • New moon Mon, Nov 9 · 4:03 pmNov 9 in 11 days
  • First quarter Tue, Nov 17 · 8:48 pmNov 17 in 19 days
  • Full moon Tue, Nov 24 · 11:54 pmNov 24 in 26 days

Perigee on October 29, 226,426 mi away, coinciding with the spring tides from October 27 to 29: they will be stronger than usual.

Place

Where to fish in Kamogawa

All places in Chiba →

Piers, ramps and tackle shops nearby

Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors

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

Deepens quickly

The bottom deepens quickly: 33 ft of water 0.25 mi from shore. It reaches 164 ft at 1.8 mi.

From the shoreline (0.5 mi from Kamogawa) out to sea, heading southeast.

How far from shore

  • 16 ft deep650 ft
  • 33 ft deep0.25 mi
  • 66 ft deep0.75 mi
  • 164 ft deep1.8 mi

For fishing, swimming and diving

  • Shore fishing. 33 ft of water just 0.25 mi from shore: a good cast reaches deep water. Current and surf hit harder here.
  • Swimming. The water gets deeper little by little, but a few dozen yards out you can no longer stand.
  • Diving. Shore diving works here: 33 ft at 0.25 mi and 66 ft at 0.75 mi from shore.

Rough estimate: here the data comes in cells of about 0.3 mi and misses details near shore (rocks, sandbars, small coves).

Source: NOAA ETOPO 2022 (CC0), cells of about 0.3 mi; depth below mean sea level. For reference only: not for navigation or anchoring.

Tides near KamogawaTides nearby

All places in Chiba, A to Z (138) →

Kamogawa at a glance

  • Town or city of about 32,116 people. Coordinates: 35.097° N, 140.100° E.
  • It is 35 mi south of Chiba, the main place in Chiba. The sun rises 1 min earlier and sets 1 min later than in Chiba.
  • The nearest tide station, Katsuura, is 8.7 mi to the east.
  • Its coast faces southeast.
  • Beaches and harbors nearby: Fisherina Kamogawa Marina (0.4 mi), Kamogawa Fishing Port (0.4 mi), Kamogawa Gyokō (0.5 mi), Niemon Ferry Pier (1.3 mi).

Questions about KamogawaQuestions

What time is high tide today in Kamogawa?

Today in Kamogawa there are high tides at 6:50 am (4.9 ft) and 5:24 pm (5.4 ft) and low tide at 11:54 am. Tide coefficient 97.

What time is sunset today in Kamogawa?

At 4:49 pm. There is light until the end of civil twilight, at 5:15 pm.

What time is sunrise tomorrow in Kamogawa?

At 5:58 am. First light comes at 5:02 am.

What phase is the moon today?

Waning gibbous, 88% illuminated. New moon on Mon, Nov 9 · 4:03 pm.

When are the next spring tides?

From October 27 to 29, together with the lunar perigee: they will be stronger than usual.

What are today's solunar periods?

Major 12:40–2:40 am, Minor 8:54–9:54 am, Major 1:12–3:12 pm, Minor 6:29–7:29 pm. Today's activity is medium.

What's the weather like today in Kamogawa?

Light drizzle, from 48 °F to 66 °F, with a light air from the north-northeast (3 mph) and a 78% chance of rain.

How is the sea today in Kamogawa?

Slight (Douglas 3): 3.0 ft waves with a period of 6.5 s from the east-southeast. The water is 75.4 °F.

When is the best time to visit Kamogawa?

The best time to visit Kamogawa is from July to August and in May: highs of 72 °F to 86 °F, about 10 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: Katsuura 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).

Spotted a mistake? Tell us · How we calculate the tide

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