Tonda marine weather forecast
Tonda (JPTND) is a port in Japan at 34°2.0′N 131°45.0′E. Today (Sep 16): NNE wind 4–4 kn, waves 1.9–2.2 m, from the NOAA GFS run 2026-09-16 18z. 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°2.0′N 131°45.0′E |
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| UN/LOCODE | JPTND |
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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 | 9 m |
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| Anchorage depth | 13 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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Facilities & services (NGA World Port Index)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Limited |
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10-day marine forecast — Tonda
| Date | Wind | Gusts | Waves |
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| NNE 4–4 kn | 6 kn | 1.9–2.2 m |
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| ENE 2–7 kn | 9 kn | 2.0–2.4 m |
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| N 2–3 kn | 6 kn | 1.9–2.0 m |
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| N 3–4 kn | 5 kn | 1.8–2.2 m |
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| NNW 5–13 kn | 18 kn | 2.0–2.1 m |
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| N 4–4 kn | 4 kn | 1.9–2.0 m |
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| NNE 3–3 kn | 3 kn | 2.1–2.1 m |
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| NE 2–2 kn | 2 kn | 0.8–0.8 m |
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| NNE 2–2 kn | 2 kn | 0.4–0.4 m |
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| SE 1–1 kn | 1 kn | 0.6–0.6 m |
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Forecast from the NOAA GFS 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 13 kn on Sep 20. The highest modeled significant wave height is 2.4 m on Sep 17. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Tonda right now?
As of the NOAA GFS run 2026-09-16 18z: NNE wind 4–4 kn, waves 1.9–2.2 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 Tonda?
Tonda is classed as a small harbor (coastal breakwater harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Tonda?
Per the NGA World Port Index, the entrance channel carries about 9 m and anchorage depths run about 13 m. Verify against current official charts before entry.