Onomichi-Itozaki marine weather forecast
Onomichi-Itozaki (JPONX) is a port in Japan at 34°23.0′N 133°10.0′E. Today (Sep 17): ENE wind 4–5 kn, waves 0.3–0.5 m, from the ECMWF IFS run 2026-09-17 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 | 34°23.0′N 133°10.0′E |
|---|
| UN/LOCODE | JPONX |
|---|
| Harbor size | Large |
|---|
| Harbor type | Coastal natural harbor |
|---|
| Shelter | Good |
|---|
| Channel depth | 9 m |
|---|
| Anchorage depth | 9 m |
|---|
| Tide range | 3 m |
|---|
| Pilotage | Advisable |
|---|
| Time zone | Asia/Tokyo |
|---|
Facilities & services (NGA World Port Index)| Tugs | Assistance available |
|---|
| Supplies | Fuel oil, water, provisions |
|---|
| Repairs | Limited |
|---|
| Medical facilities | Available |
|---|
10-day marine forecast — Onomichi-Itozaki
| Date | Wind | Gusts | Waves |
|---|
| ENE 4–5 kn | 12 kn | 0.3–0.5 m |
|---|
| NE 3–5 kn | 14 kn | 0.2–0.4 m |
|---|
| NE 5–6 kn | 14 kn | 0.3–0.6 m |
|---|
| N 7–13 kn | 30 kn | 0.5–0.6 m |
|---|
| N 6–12 kn | 27 kn | 0.4–0.6 m |
|---|
| NNE 6–9 kn | 12 kn | 0.4–0.5 m |
|---|
| NE 2–4 kn | 5 kn | 0.1–0.2 m |
|---|
| NNE 5–5 kn | 12 kn | 0.3–0.3 m |
|---|
| ESE 3–3 kn | 11 kn | 0.3–0.3 m |
|---|
| SW 7–7 kn | 16 kn | 0.9–0.9 m |
|---|
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 13 kn on Sep 20. The highest modeled significant wave height is 0.9 m on Sep 26. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Onomichi-Itozaki right now?
As of the ECMWF IFS run 2026-09-17 12z: ENE wind 4–5 kn, waves 0.3–0.5 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 Onomichi-Itozaki?
Onomichi-Itozaki is classed as a large harbor (coastal natural harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Onomichi-Itozaki?
Per the NGA World Port Index, the entrance channel carries about 9 m and anchorage depths run about 9 m. Verify against current official charts before entry.
What restricts entry to Onomichi-Itozaki?
Entry is affected by overhead clearance limits. Check the live forecast on this page and official notices before approach.