Chiba Ko marine weather forecast
Chiba Ko (JPCHB) is a port in Japan at 35°35.0′N 140°4.0′E. Today (Sep 15): SW wind 5–13 kn, waves 1.2–1.4 m, from the ECMWF IFS run 2026-09-15 00z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 35°35.0′N 140°4.0′E |
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| UN/LOCODE | JPCHB |
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| Harbor size | Small |
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| Harbor type | Coastal breakwater harbor |
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| Shelter | Good |
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| Channel depth | 17 m |
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| Anchorage depth | 23 m |
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| Tide range | 2 m |
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| Pilotage | Compulsory |
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| Time zone | Asia/Tokyo |
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Facilities & services (NGA World Port Index)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Major (hull, machinery, electrical) |
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| Medical facilities | Available |
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10-day marine forecast — Chiba Ko
| Date | Wind | Gusts | Waves |
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| SW 5–13 kn | 16 kn | 1.2–1.4 m |
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| NNE 8–22 kn | 29 kn | 1.2–1.8 m |
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| NNE 26–30 kn | 41 kn | 2.6–3.2 m |
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| NNE 28–30 kn | 42 kn | 3.1–3.3 m |
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| NNE 22–28 kn | 35 kn | 3.2–3.4 m |
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| NE 23–23 kn | 29 kn | 3.3–3.4 m |
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| ENE 28–28 kn | 36 kn | 4.0–4.0 m |
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| NNE 8–8 kn | 24 kn | 2.7–2.7 m |
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| NE 13–13 kn | 18 kn | 1.8–1.8 m |
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| NE 11–11 kn | 14 kn | 1.3–1.3 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 30 kn on Sep 18. The highest modeled significant wave height is 4.0 m on Sep 21. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Chiba Ko right now?
As of the ECMWF IFS run 2026-09-15 00z: SW wind 5–13 kn, waves 1.2–1.4 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 Chiba Ko?
Chiba Ko is classed as a small harbor (coastal breakwater harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Chiba Ko?
Per the NGA World Port Index, the entrance channel carries about 17 m and anchorage depths run about 23 m. Verify against current official charts before entry.