Santo Antonio (STSAA) — marine weather & port guide
Santo Antonio is a port in São Tomé & Príncipe at 1°39.0′N 7°27.0′E. Today (Aug 3): WSW wind 6–8 kn, waves 1.0–1.2 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 | 1°39.0′N 7°27.0′E |
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| UN/LOCODE | STSAA |
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| Harbor size | Very small |
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| Harbor type | Coastal natural harbor |
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| Shelter | Fair |
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| Channel depth | 3 m |
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| Anchorage depth | 11 m |
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| Tide range | 5 m |
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| Time zone | Africa/Sao_Tome |
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10-day marine forecast — Santo Antonio
| Date | Wind | Gusts | Waves |
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| WSW 6–8 kn | 12 kn | 1.0–1.2 m |
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| SW 7–11 kn | 15 kn | 0.8–0.9 m |
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| SSW 4–10 kn | 13 kn | 0.8–1.0 m |
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| S 5–11 kn | 16 kn | 1.0–1.2 m |
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| SW 6–14 kn | 17 kn | 1.0–1.2 m |
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| SSW 7–10 kn | 12 kn | 1.0–1.2 m |
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| SW 13–14 kn | 18 kn | 1.3–1.3 m |
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| SW 9–9 kn | 17 kn | 1.3–1.3 m |
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| SW 9–9 kn | 13 kn | 1.1–1.1 m |
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| SW 8–8 kn | 11 kn | 1.2–1.2 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 Santo Antonio right now?
As of the ECMWF IFS run 2026-08-03 12z: WSW wind 6–8 kn, waves 1.0–1.2 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 Santo Antonio?
Santo Antonio is classed as a very small harbor (coastal natural harbor), with fair shelter in the NGA World Port Index.
How deep is the approach to Santo Antonio?
Per the NGA World Port Index, the entrance channel carries about 3 m and anchorage depths run about 11 m. Verify against current official charts before entry.