San Sebastián marine weather forecast
San Sebastián (ARSSN) is a port in Argentina at 53°10.0′S 68°30.0′W. Today (Nov 1): WNW wind 13–21 kn, waves 1.2–1.5 m, from the ECMWF IFS run 2026-11-01 12z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 53°10.0′S 68°30.0′W |
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| UN/LOCODE | ARSSN |
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| Harbor size | Small |
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| Harbor type | Coastal natural harbor |
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| Shelter | Fair |
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| Anchorage depth | 14 m |
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| Tide range | 5 m |
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| Time zone | America/Argentina/Ushuaia |
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Facilities & services (NGA World Port Index)| Supplies | Fuel oil, water |
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10-day marine forecast — San Sebastián
| Date | Wind | Gusts | Waves |
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| WNW 13–21 kn | 26 kn | 1.2–1.5 m |
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| W 11–21 kn | 28 kn | 1.1–1.4 m |
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| WNW 18–23 kn | 30 kn | 1.4–1.6 m |
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| WNW 13–16 kn | 24 kn | 0.9–1.3 m |
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| W 7–16 kn | 22 kn | 0.8–1.2 m |
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| W 16–20 kn | 25 kn | 1.2–1.3 m |
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| WNW 14–24 kn | 30 kn | 1.3–1.6 m |
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| NW 19–19 kn | 29 kn | 1.4–1.4 m |
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| W 21–21 kn | 43 kn | 1.9–1.9 m |
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| NW 19–19 kn | 29 kn | 1.3–1.3 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.
What to watch in the forecast
Across the loaded 10-day outlook, the strongest daily modeled wind reaches 24 kn on Nov 7. The highest modeled significant wave height is 1.9 m on Nov 9. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at San Sebastián right now?
As of the ECMWF IFS run 2026-11-01 12z: WNW wind 13–21 kn, waves 1.2–1.5 m. The 10-day outlook is in the forecast table on this page and updates with each model cycle.
How big is the harbor at San Sebastián?
San Sebastián is classed as a small harbor (coastal natural harbor), with fair shelter in the NGA World Port Index.
How deep is the approach to San Sebastián?
Per the NGA World Port Index, anchorage depths run about 14 m. Verify against current official charts before entry.