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 (Sep 14): WSW wind 1–12 kn, waves 0.5–0.8 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 |
|---|
| Passage time at 10 kn | about 14 hours |
|---|
| Great-circle distance | 141 nm |
|---|
| Cherbourg-en-Cotentin | 49°38.0′N 1°37.0′W |
|---|
| Boulogne-sur-Mer | 50°43.0′N 1°37.0′E |
|---|
| Reference vessel | 4.5 m draft, 10 kn cruise |
|---|
10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
|---|
| WSW 1–12 kn | 15 kn | 0.5–0.8 m |
|---|
| WSW 4–16 kn | 20 kn | 0.5–1.2 m |
|---|
| WNW 4–15 kn | 22 kn | 1.0–1.3 m |
|---|
| WSW 7–21 kn | 27 kn | 1.1–2.2 m |
|---|
| WSW 5–22 kn | 27 kn | 1.2–1.8 m |
|---|
| WSW 10–22 kn | 27 kn | 1.6–2.2 m |
|---|
| W 8–12 kn | 15 kn | 1.1–1.5 m |
|---|
| W 3–9 kn | 12 kn | 0.5–0.6 m |
|---|
| NNW 2–6 kn | 11 kn | 0.3–0.4 m |
|---|
| E 7–10 kn | 12 kn | 0.4–0.5 m |
|---|
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 2026-09-14 00z: WSW wind 1–12 kn, waves 0.5–0.8 m. The day-by-day table on this page covers the next 10 days.