Iwakuni Ko (JPIWK) — marine weather & port guide
Iwakuni Ko is a port in Japan at 34°11.0′N 132°15.0′E. Today (Aug 3): ENE wind 1–4 kn, waves 0.9–1.0 m, from the ECMWF IFS run 2026-08-03 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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10-day marine forecast — Iwakuni Ko
| Date | Wind | Gusts | Waves |
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| ENE 1–4 kn | 7 kn | 0.9–1.0 m |
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| ENE 0–5 kn | 13 kn | 0.7–0.8 m |
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| ENE 2–6 kn | 16 kn | 0.8–1.1 m |
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| E 8–10 kn | 22 kn | 0.9–1.0 m |
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| E 6–11 kn | 25 kn | 0.8–0.9 m |
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| ESE 0–7 kn | 9 kn | 0.7–0.8 m |
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| ENE 3–6 kn | 7 kn | 1.2–1.8 m |
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| NE 2–2 kn | 14 kn | 2.3–2.3 m |
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| E 1–1 kn | 12 kn | 1.4–1.4 m |
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| NE 1–1 kn | 12 kn | 1.2–1.2 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.
Frequently asked
How is the weather at Iwakuni Ko right now?
As of the ECMWF IFS run 2026-08-03 12z: ENE wind 1–4 kn, waves 0.9–1.0 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.