Galveston to San Francisco — sea route & marine weather
The sea route from Galveston (USGLS) to San Francisco (USSFO) is about 4,882 nm — about 20 days at 10 kn. Along the route today (Aug 3): WSW wind 0–19 kn, waves 0.5–3.5 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 4,882 nm |
|---|
| Passage time at 10 kn | about 20 days |
|---|
| Great-circle distance | 1,469 nm |
|---|
| Galveston | 29°19.0′N 94°47.0′W |
|---|
| San Francisco | 37°49.0′N 122°25.0′W |
|---|
| Reference vessel | 4.5 m draft, 10 kn cruise |
|---|
10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
|---|
| WSW 0–19 kn | 22 kn | 0.5–3.5 m |
|---|
| S 0–18 kn | 25 kn | 0.3–2.9 m |
|---|
| SSW 0–18 kn | 24 kn | 0.3–2.1 m |
|---|
| SSW 0–18 kn | 26 kn | 0.4–1.8 m |
|---|
| SSE 0–15 kn | 20 kn | 0.5–1.8 m |
|---|
| S 0–15 kn | 19 kn | 0.5–1.8 m |
|---|
| SE 1–22 kn | 28 kn | 0.5–3.0 m |
|---|
| SSE 1–18 kn | 27 kn | 0.5–3.2 m |
|---|
| SSW 1–20 kn | 26 kn | 0.7–2.9 m |
|---|
| S 0–25 kn | 34 kn | 0.7–3.1 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 Galveston to San Francisco by sea?
The water route is 4,882 nm (9,042 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from San Francisco to Galveston.
How long does the passage from Galveston to San Francisco take?
about 20 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 Galveston and San Francisco today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: WSW wind 0–19 kn, waves 0.5–3.5 m. The day-by-day table on this page covers the next 10 days.