South Tarawa, Kiribati 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 Pacific/Tarawa local. Folk tradition, not a scientific forecast.

Next spring tide on Thu 21 May (range 1.1m). Next neap on Fri 22 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.

South Tarawa is the capital of Kiribati — a chain of islets connected by causeways running 35 kilometres from Betio in the west to Bonriki in the east. The urban strip holds around 63,000 people on a total land area of roughly 16 square kilometres, with population density in some wards exceeding 15,000 per square kilometre. By that measure it is one of the most densely populated places on Earth, on land averaging less than 2 metres above sea level. The tidal regime at South Tarawa is mixed semidiurnal with a spring range of 0.8 to 1.5 metres. The diurnal inequality is moderate: the two daily highs and two daily lows differ in height, with the dominant tide driven by the M2 component and modified by the K1 and O1 diurnal constituents typical of the central Pacific. At spring peak high water, the ocean surface sits within centimetres of the road level on the lowest causeways and foreshore sections. King tides — perigean springs occurring two to four times per year — already flood roads, wells, and gardens across South Tarawa. This is not a theoretical risk; it is a regular event documented by the Kiribati Meteorological Service. Tide data for South Tarawa comes from Open-Meteo Marine, a global gridded ocean model. Accuracy is typically ±45 minutes on timing and ±0.2 to 0.3 metres on height. At South Tarawa's elevation, that ±0.2 to 0.3 metre model uncertainty represents the difference between a dry road and a flooded one on a high spring tide. For inundation risk and infrastructure planning, consult Kiribati Meteorological Service tide gauge records rather than the model prediction used here. The Battle of Tarawa was fought on Betio in November 1943 — a 76-hour US Marine assault on a heavily fortified Japanese position that resulted in over 1,000 American and 4,500 Japanese deaths on a 150-hectare island. The Tarawa War Cemetery (CWGC) on Betio holds 22 identified Commonwealth graves and a memorial to 38 unidentified. The American Battle Monuments Commission maintains a separate memorial. Japanese coastal defence guns — 8-inch naval rifles installed by the garrison — remain in place on Betio's southwestern seawall, at the water's edge. At high water the base of the seawall platform is washed; at low water a narrow reef flat is exposed between the guns and the lagoon. The visual drama of these guns against the open ocean is strongest at the turn of a high spring tide. For visitors navigating South Tarawa on foot or bicycle, the causeway system is the only land route between islets. The main causeways are 3 to 5 metres above sea level at their crowns but taper at the abutments to near sea level. During a spring high tide, the causeway shoulders are the first sections to take water; the road surface remains passable. During a king tide combined with a westerly swell surge, the lowest causeway sections can be briefly covered. Travellers on the islet chain during predicted king-tide events should confirm road access with local contacts. Fishing from the South Tarawa lagoon shore and the reef passages is a subsistence activity for most of the population — not sport. The main species targeted from the inner lagoon shore are milkfish (ikari), reef snapper, and bonefish on the tidal flats. Bonefish feeding runs move onto the reef flat on the flood tide — approximately two hours after the predicted low — and retreat as the water shallows on the ebb. Casting small shrimp or crab imitations into the advancing flood edge is the standard technique. Bonefish on Tarawa's flats are wild and lightly fished; the population is healthy by atoll standards, though not widely known to international fly-fishing visitors. Sea-level rise projections for Kiribati under the IPCC AR6 moderate emissions scenario indicate 0.3 to 0.5 metres of additional mean sea level rise by 2100 relative to the 2005 baseline. Against a current spring tidal range of 0.8 to 1.5 metres, an additional 0.3 to 0.5 metres of mean level raises the king-tide surface by the same amount — carrying the inundation frequency and extent that currently occurs a few times per year to near-permanent during high-tide periods on the lowest land. The I-Kiribati government has made bilateral migration agreements with Fiji, Australia, and New Zealand as one strand of adaptation strategy; the government's official position is that it will continue to fight for the territory's viability, not assume abandonment.