Next high tide at Tokyo Bay (Harumi): 14:00 GMT+9, 0.44 m

Tide times at Tokyo Bay (Harumi) on Monday, 27 April 2026: first low tide at 09:00, first high tide at 14:00, second low tide at 20:00. Sunrise 04:54, sunset 18:22.

Tide curve — next 24 hours

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.

Best windows Mon 27 Apr

Suggested time slots at Tokyo Bay (Harumi), derived from the tide, sun, moon, and conditions data on this page. Rough guidance, not a forecast.

• Tidepooling
  Around 20:00, lowest tide today
  Tide drops to -0.36 m for about an hour either side
  Confidence: high
  7-day tidepooling strip →
• Fishing
  Around 02:26, solunar major near sunrise
  Moon transit nearest the sun's horizon — angler tradition only, no certainty
  Confidence: medium
  7-day fishing strip →

Spring & neap tides at Tokyo Bay (Harumi)

Next spring tide on Fri 01 May (range 1.6m). Last neap on Mon 27 Apr.

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.

About tides at Tokyo Bay (Harumi)

Tokyo Bay opens south through the narrow Uraga Channel between Yokosuka and the Bōsō Peninsula, a 7-kilometre throat where the open Pacific reaches in to fill a partially-enclosed basin ringed by Tokyo, Yokohama, Kawasaki, and Chiba. The tide signature here is a moderate mixed-semidiurnal signal — two highs and two lows of unequal size each day, the bigger swing falling on the lower-low water — with the pattern shifting toward strongly diurnal at certain points in the lunar month. Mean range at the Harumi gauge in central Tokyo is about 1.3 metres, climbing past 2.0 metres on the largest spring tides and dropping near 0.6 on neaps. That is modest compared with the Pacific Northwest US or the European North Sea, but the bay's geometry concentrates currents through the Uraga Channel to over two knots on the change of tide, which the working pilots on the deep-water container approaches at Yokohama and the Tokyo-Bay ferry skippers reading for Kanazawa-Hakkei and Kisarazu both notice. The wholesale fish market at Toyosu (which moved from Tsukiji in 2018) timed its working hours around the Edomae inshore fishing fleet for centuries, and the rhythm survives in the tsukudani salt-cooked seafood that originated on the bay shore. Sailors out of Yokosuka and the Miura Peninsula reading for the open Sagami Bay, surfers at Kujūkuri on the Bōsō outer coast, and shellfish harvesters at the few remaining tidal flats around Funabashi each read the table for different windows. Open-Meteo Marine drives the gridded predictions on this page; for authoritative Japanese tide data, the Japan Meteorological Agency and the Japan Coast Guard Hydrographic and Oceanographic Department publish the official tide tables and operate the Harumi reference gauge.

Common questions about tides at Tokyo Bay (Harumi)