Galveston to Port Arthur — sea route & marine weather
The sea route from Galveston (USGLS) to Port Arthur (USPOA) is about 69 nm — about 7 hours at 10 kn. Along the route today (Aug 3): WSW wind 1–4 kn, waves 0.5–0.6 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 69 nm |
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| Passage time at 10 kn | about 7 hours |
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| Great-circle distance | 53 nm |
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| Galveston | 29°19.0′N 94°47.0′W |
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| Port Arthur | 29°50.0′N 93°58.0′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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| WSW 1–4 kn | 9 kn | 0.5–0.6 m |
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| S 0–7 kn | 12 kn | 0.5–0.5 m |
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| SSW 1–7 kn | 14 kn | 0.6–0.7 m |
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| SSW 1–8 kn | 14 kn | 0.7–0.9 m |
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| SSE 1–7 kn | 13 kn | 0.6–0.8 m |
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| S 1–6 kn | 8 kn | 0.6–0.6 m |
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| SE 5–6 kn | 8 kn | 0.6–0.6 m |
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| SSE 2–2 kn | 7 kn | 0.8–0.8 m |
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| SSW 4–4 kn | 11 kn | 0.9–0.9 m |
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| S 4–4 kn | 8 kn | 0.9–0.9 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 Galveston to Port Arthur by sea?
The water route is 69 nm (128 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Port Arthur to Galveston.
How long does the passage from Galveston to Port Arthur take?
about 7 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 Galveston and Port Arthur today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: WSW wind 1–4 kn, waves 0.5–0.6 m. The day-by-day table on this page covers the next 10 days.