Wakayama-Shimotsu Ko to Sakai-Senboku — sea route & marine weather
The sea route from Wakayama-Shimotsu Ko (JPWAK) to Sakai-Senboku (JPSBK) is about 35 nm — about 3 hours at 10 kn. Along the route today (Sep 13): S wind 7–17 kn, waves 0.2–0.7 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 35 nm |
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| Passage time at 10 kn | about 3 hours |
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| Great-circle distance | 26 nm |
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| Wakayama-Shimotsu Ko | 34°12.0′N 135°8.0′E |
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| Sakai-Senboku | 34°33.0′N 135°26.0′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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| S 7–17 kn | 24 kn | 0.2–0.7 m |
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| S 7–16 kn | 18 kn | 0.2–0.6 m |
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| ESE 4–8 kn | 8 kn | 0.2–0.3 m |
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| NE 2–6 kn | 8 kn | 0.3–0.5 m |
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| NNW 6–6 kn | 7 kn | 0.2–0.4 m |
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| SW 3–3 kn | 2 kn | 0.2–0.3 m |
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| NNE 4–4 kn | 6 kn | 0.6–0.6 m |
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| NNE 8–8 kn | 12 kn | 0.9–0.9 m |
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| ENE 18–18 kn | 22 kn | 0.5–0.5 m |
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| NNE 43–43 kn | 63 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.
Frequently asked
How far is it from Wakayama-Shimotsu Ko to Sakai-Senboku by sea?
The water route is 35 nm (64 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Sakai-Senboku to Wakayama-Shimotsu Ko.
How long does the passage from Wakayama-Shimotsu Ko to Sakai-Senboku take?
about 3 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 Wakayama-Shimotsu Ko and Sakai-Senboku today?
Along the route today, per the NOAA GFS run 2026-09-13 06z: S wind 7–17 kn, waves 0.2–0.7 m. The day-by-day table on this page covers the next 10 days.