Mombetsu Ko — marine weather & port guide
Mombetsu Ko is a port in Japan at 44°21.0′N 143°21.0′E. Today (Aug 3): SSW wind 6–7 kn, waves 0.4–0.6 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 | 44°21.0′N 143°21.0′E |
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| Harbor size | Very small |
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| Harbor type | Coastal breakwater harbor |
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| Shelter | Good |
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| Channel depth | 11 m |
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| Anchorage depth | 11 m |
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| Tide range | 3 m |
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| Time zone | Asia/Tokyo |
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10-day marine forecast — Mombetsu Ko
| Date | Wind | Gusts | Waves |
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| SSW 6–7 kn | 16 kn | 0.4–0.6 m |
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| SSW 7–8 kn | 21 kn | 0.6–0.8 m |
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| SSW 7–8 kn | 21 kn | 0.8–1.0 m |
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| SSW 5–7 kn | 17 kn | 0.6–0.7 m |
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| SSW 7–7 kn | 18 kn | 0.5–1.0 m |
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| N 6–9 kn | 11 kn | 0.8–1.6 m |
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| NNE 5–6 kn | 7 kn | 0.6–0.7 m |
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| NNE 5–5 kn | 18 kn | 1.2–1.2 m |
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| NE 6–6 kn | 27 kn | 2.1–2.1 m |
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| S 7–7 kn | 22 kn | 1.7–1.7 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 Mombetsu Ko right now?
As of the ECMWF IFS run 2026-08-03 12z: SSW wind 6–7 kn, waves 0.4–0.6 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 Mombetsu Ko?
Mombetsu Ko is classed as a very small harbor (coastal breakwater harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Mombetsu Ko?
Per the NGA World Port Index, the entrance channel carries about 11 m and anchorage depths run about 11 m. Verify against current official charts before entry.
What restricts entry to Mombetsu Ko?
Entry is affected by ice, heavy swell. Check the live forecast on this page and official notices before approach.