Iwakuni Ko marine weather forecast
Iwakuni Ko (JPIWK) is a port in Japan at 34°11.0′N 132°15.0′E. Today (Sep 13): SW wind 2–4 kn, waves 0.3–0.4 m, from the ECMWF IFS run 2026-09-13 12z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 34°11.0′N 132°15.0′E |
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| UN/LOCODE | JPIWK |
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| Harbor size | Medium |
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| Harbor type | Open roadstead |
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| Shelter | Good |
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| Channel depth | 22 m |
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| Anchorage depth | 14 m |
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| Tide range | 3 m |
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| Pilotage | Advisable |
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| Time zone | Asia/Tokyo |
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Facilities & services (NGA World Port Index)| Tugs | Assistance and salvage available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Limited |
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| Medical facilities | Available |
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10-day marine forecast — Iwakuni Ko
| Date | Wind | Gusts | Waves |
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| SW 2–4 kn | 10 kn | 0.3–0.4 m |
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| WNW 2–6 kn | 16 kn | 0.3–0.9 m |
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| NE 2–4 kn | 11 kn | 0.9–1.6 m |
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| NE 3–6 kn | 14 kn | 1.7–2.1 m |
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| ENE 5–6 kn | 15 kn | 1.9–2.2 m |
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| ENE 4–6 kn | 7 kn | 1.5–1.7 m |
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| E 6–7 kn | 8 kn | 1.5–2.3 m |
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| E 8–8 kn | 18 kn | 2.3–2.3 m |
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| ENE 11–11 kn | 25 kn | 3.4–3.4 m |
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| NNW 8–8 kn | 40 kn | 4.0–4.0 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
What to watch in the forecast
Across the loaded 10-day outlook, the strongest daily modeled wind reaches 11 kn on Sep 21. The highest modeled significant wave height is 4.0 m on Sep 22. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Iwakuni Ko right now?
As of the ECMWF IFS run 2026-09-13 12z: SW wind 2–4 kn, waves 0.3–0.4 m. The 10-day outlook is in the forecast table on this page and updates with each model cycle.
How big is the harbor at Iwakuni Ko?
Iwakuni Ko is classed as a medium harbor (open roadstead), with good shelter in the NGA World Port Index.
How deep is the approach to Iwakuni Ko?
Per the NGA World Port Index, the entrance channel carries about 22 m and anchorage depths run about 14 m. Verify against current official charts before entry.
What restricts entry to Iwakuni Ko?
Entry is affected by tidal windows, heavy swell. Check the live forecast on this page and official notices before approach.