Boston to Ireland Island — sea route & marine weather
The sea route from Boston (USBOS) to Ireland Island (BMFPT) is about 700 nm — about 3 days at 10 kn. Along the route today (Aug 3): SSW wind 10–26 kn, waves 0.9–2.4 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 700 nm |
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| Passage time at 10 kn | about 3 days |
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| Great-circle distance | 670 nm |
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| Boston | 42°21.0′N 71°3.0′W |
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| Ireland Island | 32°19.0′N 64°50.0′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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| SSW 10–26 kn | 34 kn | 0.9–2.4 m |
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| WNW 3–24 kn | 31 kn | 0.7–2.5 m |
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| SW 2–20 kn | 26 kn | 0.5–2.0 m |
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| SSW 7–14 kn | 17 kn | 0.4–1.0 m |
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| WSW 4–16 kn | 21 kn | 0.5–1.2 m |
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| SW 6–18 kn | 22 kn | 0.4–1.3 m |
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| WSW 5–19 kn | 24 kn | 0.5–1.5 m |
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| WNW 6–15 kn | 24 kn | 0.3–1.5 m |
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| WSW 8–17 kn | 26 kn | 0.6–1.4 m |
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| NNW 5–16 kn | 22 kn | 0.3–1.3 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 Ireland Island by sea?
The water route is 700 nm (1,297 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Ireland Island to Boston.
How long does the passage from Boston to Ireland Island take?
about 3 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 Ireland Island today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: SSW wind 10–26 kn, waves 0.9–2.4 m. The day-by-day table on this page covers the next 10 days.