Jeju City 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 13:00 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 Asia/Seoul local. Folk tradition, not a scientific forecast.

Next spring tide on Sun 17 May (range 2.9m). Last neap on Sat 16 May. 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.

Jeju Island is South Korea's largest island and a UNESCO Triple Crown designation (Biosphere Reserve, World Natural Heritage, and Geopark) off the southern tip of the Korean Peninsula. Jeju City on the north coast is the main population and transport hub; the volcanic landscape of Hallasan (1950 m, the highest peak in South Korea) dominates the island's interior. Tidal pattern is semidiurnal with a mean spring range of about 1.5 metres — slightly less than the mainland southern coast. The coastal character of Jeju is entirely volcanic basalt — black lava rock, sea cliffs, and lava tube caves that extend to the coast. Manjangul Cave (a 13.4-km lava tube system, partly accessible to visitors) ends near the north coast. The Hyeopjae Beach on the west coast has unusually clear water (subtropical, warm — 22 to 26°C in summer) over white coral sand that contrasts dramatically with the surrounding black basalt. Haenyeo diving is practised extensively around Jeju — the island is the primary haenyeo culture centre. The women's free-diving community has a dedicated museum (Haenyeo Museum, east coast near Seongsan) and regular public demonstration dives. The traditional haenyeo dive is to 10 to 20 metres without SCUBA, targeting abalone, conch, and sea urchin. Scuba diving around Jeju is in warm, subtropical water (20 to 26°C in summer, 15 to 17°C in winter) with excellent visibility and diverse marine life: hawksbill turtles, subtropical reef fish, and kelp forest diving on the eastern coast (colder, more temperate marine environment from the East Korea Current). The dive sites around Seogwipo on the south coast are considered the best in Korea. Seongsan Ilchulbong (Sunrise Peak) is a 182-metre tuff crater on the eastern tip of Jeju — the volcanic cone rises from the sea and is accessible by a 20-minute trail from the base. The crater rim gives views of the Olle trails (Jeju's famous coastal walking paths) and the sunrise at dawn. The site is busy year-round; early morning is the only quiet time. Predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height — model-derived, not from a local gauge. For Korean tide data, consult the Korea Hydrographic and Oceanographic Agency at khoa.go.kr.