Cherbourg-en-Cotentin to Boulogne-sur-Mer — sea route & marine weather
The sea route from Cherbourg-en-Cotentin (FRCER) to Boulogne-sur-Mer (FRBOL) is about 138 nm — about 14 hours at 10 kn. Along the route today (Nov 2): NNE wind 2–25 kn, waves 0.9–2.2 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 138 nm |
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| Passage time at 10 kn | about 14 hours |
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| Great-circle distance | 141 nm |
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| Cherbourg-en-Cotentin | 49°38.0′N 1°37.0′W |
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| Boulogne-sur-Mer | 50°43.0′N 1°37.0′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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| NNE 2–25 kn | 34 kn | 0.9–2.2 m |
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| NE 8–26 kn | 35 kn | 1.7–2.2 m |
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| ENE 10–26 kn | 36 kn | 1.9–2.7 m |
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| ENE 6–23 kn | 31 kn | 1.1–2.4 m |
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| NE 0–14 kn | 18 kn | 0.3–1.2 m |
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| NW 3–8 kn | 10 kn | 0.3–0.5 m |
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| SW 4–5 kn | 6 kn | 0.2–0.2 m |
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| SSE 3–9 kn | 12 kn | 0.3–0.3 m |
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| SE 10–17 kn | 30 kn | 1.2–1.6 m |
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| SE 7–8 kn | 16 kn | 0.6–1.4 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 Cherbourg-en-Cotentin to Boulogne-sur-Mer by sea?
The water route is 138 nm (256 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Boulogne-sur-Mer to Cherbourg-en-Cotentin.
How long does the passage from Cherbourg-en-Cotentin to Boulogne-sur-Mer take?
about 14 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 Cherbourg-en-Cotentin and Boulogne-sur-Mer today?
Along the route today, per the ECMWF IFS run 2026-11-02 00z: NNE wind 2–25 kn, waves 0.9–2.2 m. The day-by-day table on this page covers the next 10 days.