Osaka to Wakayama-Shimotsu Ko — sea route & marine weather
The sea route from Osaka (JPOSA) to Wakayama-Shimotsu Ko (JPWAK) is about 37 nm — about 4 hours at 10 kn. Along the route today (Nov 1): SSW wind 6–19 kn, waves 0.3–0.5 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 37 nm |
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| Passage time at 10 kn | about 4 hours |
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| Great-circle distance | 31 nm |
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| Osaka | 34°39.0′N 135°26.0′E |
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| Wakayama-Shimotsu Ko | 34°12.0′N 135°8.0′E |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| SSW 6–19 kn | 26 kn | 0.3–0.5 m |
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| NNW 5–14 kn | 16 kn | 0.4–0.8 m |
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| N 9–12 kn | 15 kn | 0.3–0.4 m |
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| ENE 8–13 kn | 14 kn | 0.4–0.9 m |
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| WSW 1–21 kn | 25 kn | 0.3–0.9 m |
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| NW 17–17 kn | 19 kn | 0.6–1.0 m |
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| N 7–7 kn | 9 kn | 0.5–0.7 m |
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| NW 6–6 kn | 6 kn | 0.5–0.5 m |
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| NNW 17–17 kn | 22 kn | 0.4–0.4 m |
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| N 10–10 kn | 14 kn | 0.3–0.3 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.
Frequently asked
How far is it from Osaka to Wakayama-Shimotsu Ko by sea?
The water route is 37 nm (68 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Wakayama-Shimotsu Ko to Osaka.
How long does the passage from Osaka to Wakayama-Shimotsu Ko take?
about 4 hours at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Osaka and Wakayama-Shimotsu Ko today?
Along the route today, per the NOAA GFS run 2026-11-01 18z: SSW wind 6–19 kn, waves 0.3–0.5 m. The day-by-day table on this page covers the next 10 days.