Wakayama-Shimotsu Ko marine weather forecast
Wakayama-Shimotsu Ko (JPWAK) is a port in Japan at 34°12.0′N 135°8.0′E. Today (Sep 15): N wind 1–7 kn, waves 0.2–0.4 m, from the NOAA GFS run 2026-09-15 06z. 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°12.0′N 135°8.0′E |
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| UN/LOCODE | JPWAK |
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| Harbor size | Large |
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| Harbor type | Coastal breakwater harbor |
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| Shelter | Fair |
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| Channel depth | 11 m |
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| Anchorage depth | 23 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)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Limited |
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| Medical facilities | Available |
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| Largest vessel | 320 m length overall, 54 m beam, 14 m draft |
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10-day marine forecast — Wakayama-Shimotsu Ko
| Date | Wind | Gusts | Waves |
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| N 1–7 kn | 9 kn | 0.2–0.4 m |
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| NNE 3–14 kn | 18 kn | 0.3–0.4 m |
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| NNE 5–16 kn | 16 kn | 0.3–0.4 m |
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| NNW 4–5 kn | 6 kn | 0.2–0.4 m |
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| NNW 8–8 kn | 13 kn | 0.3–0.5 m |
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| N 17–17 kn | 21 kn | 0.4–0.7 m |
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| NNW 20–20 kn | 30 kn | 0.5–0.5 m |
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| N 17–17 kn | 19 kn | 0.6–0.6 m |
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| NNE 8–8 kn | 11 kn | 0.2–0.2 m |
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| WSW 3–3 kn | 4 kn | 0.2–0.2 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 20 kn on Sep 21. The highest modeled significant wave height is 0.7 m on Sep 20. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Wakayama-Shimotsu Ko right now?
As of the NOAA GFS run 2026-09-15 06z: N wind 1–7 kn, waves 0.2–0.4 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 Wakayama-Shimotsu Ko?
Wakayama-Shimotsu Ko is classed as a large harbor (coastal breakwater harbor), with fair shelter in the NGA World Port Index.
How deep is the approach to Wakayama-Shimotsu Ko?
Per the NGA World Port Index, the entrance channel carries about 11 m and anchorage depths run about 23 m. Verify against current official charts before entry.
What restricts entry to Wakayama-Shimotsu Ko?
Entry is affected by heavy swell, overhead clearance limits. Check the live forecast on this page and official notices before approach.
What is the largest vessel Wakayama-Shimotsu Ko can take?
The NGA World Port Index lists the maximum vessel at about 320 m length overall, 54 m beam, 14 m draft. Confirm current limits with the port authority before arrival.