Karatsu marine weather forecast
Karatsu (JPKAR) is a port in Japan at 33°29.0′N 129°58.0′E. Today (Nov 2): NNW wind 12–15 kn, waves 1.3–1.4 m, from the ECMWF IFS run 2026-11-02 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 | 33°29.0′N 129°58.0′E |
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| UN/LOCODE | JPKAR |
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| Harbor size | Small |
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| Harbor type | Coastal natural harbor |
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| Shelter | Good |
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| Channel depth | 6 m |
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| Anchorage depth | 9 m |
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| Tide range | 2 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)| Supplies | Fuel oil, water |
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| Repairs | Limited |
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| Medical facilities | Available |
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10-day marine forecast — Karatsu
| Date | Wind | Gusts | Waves |
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| NNW 12–15 kn | 22 kn | 1.3–1.4 m |
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| NNE 11–15 kn | 22 kn | 1.1–1.6 m |
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| ESE 11–16 kn | 23 kn | 0.9–1.3 m |
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| ESE 8–21 kn | 30 kn | 0.7–1.3 m |
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| NW 21–24 kn | 30 kn | 1.8–2.9 m |
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| NNW 8–16 kn | 20 kn | 1.9–2.8 m |
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| NNE 7–8 kn | 10 kn | 1.1–1.5 m |
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| N 11–11 kn | 16 kn | 1.0–1.0 m |
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| NE 21–21 kn | 27 kn | 2.1–2.1 m |
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| NW 6–6 kn | 14 kn | 1.1–1.1 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 24 kn on Nov 6. The highest modeled significant wave height is 2.9 m on Nov 6. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Karatsu right now?
As of the ECMWF IFS run 2026-11-02 12z: NNW wind 12–15 kn, waves 1.3–1.4 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 Karatsu?
Karatsu is classed as a small harbor (coastal natural harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Karatsu?
Per the NGA World Port Index, the entrance channel carries about 6 m and anchorage depths run about 9 m. Verify against current official charts before entry.
What restricts entry to Karatsu?
Entry is affected by heavy swell. Check the live forecast on this page and official notices before approach.