São Sebastião marine weather forecast
São Sebastião (BRSSO) is a port in Brazil at 23°48.0′S 45°24.0′W. Today (Sep 14): ENE wind 9–17 kn, waves 1.4–1.8 m, from the NOAA GFS run 2026-09-14 06z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 23°48.0′S 45°24.0′W |
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| UN/LOCODE | BRSSO |
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| Harbor size | Small |
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| Harbor type | Open roadstead |
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| Shelter | Poor |
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| Channel depth | 9 m |
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| Anchorage depth | 20 m |
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| Tide range | 1 m |
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| Pilotage | Compulsory |
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| Time zone | America/Sao_Paulo |
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Facilities & services (NGA World Port Index)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water |
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| Repairs | Limited |
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| Medical facilities | Available |
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10-day marine forecast — São Sebastião
| Date | Wind | Gusts | Waves |
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| ENE 9–17 kn | 19 kn | 1.4–1.8 m |
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| WSW 12–18 kn | 20 kn | 1.8–1.9 m |
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| SW 9–10 kn | 10 kn | 1.5–1.6 m |
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| E 14–17 kn | 19 kn | 1.8–2.2 m |
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| ENE 22–22 kn | 25 kn | 2.1–2.2 m |
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| ENE 21–21 kn | 25 kn | 2.3–2.5 m |
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| ENE 21–21 kn | 23 kn | 2.5–2.5 m |
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| NNE 14–14 kn | 18 kn | 2.2–2.2 m |
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| NNE 6–6 kn | 6 kn | 1.5–1.5 m |
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| N 9–9 kn | 10 kn | 1.4–1.4 m |
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Forecast from the NOAA GFS 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 22 kn on Sep 18. The highest modeled significant wave height is 2.5 m on Sep 19. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at São Sebastião right now?
As of the NOAA GFS run 2026-09-14 06z: ENE wind 9–17 kn, waves 1.4–1.8 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 São Sebastião?
São Sebastião is classed as a small harbor (open roadstead), with poor shelter in the NGA World Port Index.
How deep is the approach to São Sebastião?
Per the NGA World Port Index, the entrance channel carries about 9 m and anchorage depths run about 20 m. Verify against current official charts before entry.
What restricts entry to São Sebastião?
Entry is affected by overhead clearance limits. Check the live forecast on this page and official notices before approach.