Tateyama Ko (JPTTY) — marine weather & port guide
Tateyama Ko is a port in Japan at 35°0.0′N 139°48.0′E. Today (Aug 3): NE wind 24–26 kn, waves 3.6–4.0 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 | 35°0.0′N 139°48.0′E |
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| UN/LOCODE | JPTTY |
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| Harbor size | Very small |
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| Harbor type | Coastal natural harbor |
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| Shelter | Fair |
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| Channel depth | 17 m |
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| Anchorage depth | 17 m |
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| Tide range | 1 m |
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| Time zone | Asia/Tokyo |
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10-day marine forecast — Tateyama Ko
| Date | Wind | Gusts | Waves |
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| NE 24–26 kn | 34 kn | 3.6–4.0 m |
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| NE 22–25 kn | 33 kn | 3.8–4.1 m |
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| ENE 12–22 kn | 31 kn | 2.8–3.6 m |
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| E 5–12 kn | 15 kn | 2.4–2.7 m |
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| SSE 6–11 kn | 14 kn | 2.2–2.3 m |
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| ESE 1–8 kn | 9 kn | 2.0–2.1 m |
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| NNE 10–11 kn | 13 kn | 2.1–2.2 m |
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| ENE 16–16 kn | 22 kn | 3.0–3.0 m |
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| S 3–3 kn | 13 kn | 1.8–1.8 m |
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| ENE 9–9 kn | 13 kn | 1.5–1.5 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 Tateyama Ko right now?
As of the ECMWF IFS run 2026-08-03 12z: NE wind 24–26 kn, waves 3.6–4.0 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 Tateyama Ko?
Tateyama Ko is classed as a very small harbor (coastal natural harbor), with fair shelter in the NGA World Port Index.
How deep is the approach to Tateyama Ko?
Per the NGA World Port Index, the entrance channel carries about 17 m and anchorage depths run about 17 m. Verify against current official charts before entry.