Boston to Sept-Iles — sea route & marine weather
The sea route from Boston (USBOS) to Sept-Iles (CASEI) is about 1,014 nm — about 4 days at 10 kn. Along the route today (Nov 2): W wind 3–18 kn, waves 0.4–2.5 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 1,014 nm |
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| Passage time at 10 kn | about 4 days |
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| Great-circle distance | 509 nm |
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| Boston | 42°21.0′N 71°3.0′W |
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| Sept-Iles | 50°12.0′N 66°23.0′W |
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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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| W 3–18 kn | 28 kn | 0.4–2.5 m |
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| WNW 1–21 kn | 27 kn | 0.2–1.9 m |
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| SSE 3–22 kn | 29 kn | 0.2–1.6 m |
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| SSE 3–22 kn | 32 kn | 0.4–2.0 m |
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| SW 2–19 kn | 25 kn | 0.4–1.6 m |
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| 3–20 kn | 25 kn | 0.4–1.5 m |
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| 3–22 kn | 28 kn | 0.6–2.5 m |
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| WNW 3–18 kn | 29 kn | 0.4–1.8 m |
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| NW 6–25 kn | 37 kn | 0.2–2.3 m |
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| WNW 11–24 kn | 37 kn | 0.8–3.0 m |
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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.
Frequently asked
How far is it from Boston to Sept-Iles by sea?
The water route is 1,014 nm (1,878 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Sept-Iles to Boston.
How long does the passage from Boston to Sept-Iles take?
about 4 days 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 Boston and Sept-Iles today?
Along the route today, per the ECMWF IFS run 2026-11-02 12z: W wind 3–18 kn, waves 0.4–2.5 m. The day-by-day table on this page covers the next 10 days.