San Sebastián (ARSSN) — marine weather & port guide
San Sebastián is a port in Argentina at 53°10.0′S 68°30.0′W. Today (Aug 3): ENE wind 17–20 kn, waves 2.8–3.2 m, from the ECMWF IFS run 2026-08-03 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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10-day marine forecast — San Sebastián
| Date | Wind | Gusts | Waves |
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| ENE 17–20 kn | 27 kn | 2.8–3.2 m |
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| E 15–17 kn | 22 kn | 2.5–3.2 m |
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| E 6–14 kn | 20 kn | 1.4–2.3 m |
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| N 4–12 kn | 17 kn | 1.0–1.2 m |
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| ENE 7–11 kn | 14 kn | 0.9–1.0 m |
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| S 10–27 kn | 34 kn | 0.8–1.5 m |
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| WSW 15–17 kn | 21 kn | 1.0–1.8 m |
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| SW 13–13 kn | 22 kn | 0.8–0.8 m |
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| WSW 12–12 kn | 17 kn | 0.8–0.8 m |
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| ESE 5–5 kn | 7 kn | 0.2–0.2 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 is the weather at San Sebastián right now?
As of the ECMWF IFS run 2026-08-03 12z: ENE wind 17–20 kn, waves 2.8–3.2 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.