Southwest Pass marine weather forecast
Southwest Pass (USSW8) is a port in United States at 29°0.0′N 89°20.0′W. Today (Sep 15): NNE wind 2–3 kn, waves 0.3–0.6 m, from the ECMWF IFS run 2026-09-15 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 | 29°0.0′N 89°20.0′W |
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| UN/LOCODE | USSW8 |
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| Harbor size | Small |
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| Harbor type | River natural harbor |
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| Shelter | None |
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| Channel depth | 14 m |
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| Tide range | 0 m |
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| Time zone | America/Chicago |
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10-day marine forecast — Southwest Pass
| Date | Wind | Gusts | Waves |
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| NNE 2–3 kn | 9 kn | 0.3–0.6 m |
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| E 1–11 kn | 24 kn | 0.6–1.0 m |
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| E 4–10 kn | 20 kn | 1.2–2.0 m |
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| E 2–7 kn | 15 kn | 1.7–2.0 m |
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| WSW 2–4 kn | 8 kn | 1.0–1.5 m |
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| W 3–4 kn | 5 kn | 0.6–0.9 m |
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| ESE 1–4 kn | 5 kn | 0.5–0.6 m |
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| E 3–3 kn | 5 kn | 0.6–0.6 m |
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| NNE 6–6 kn | 10 kn | 0.6–0.6 m |
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| NE 7–7 kn | 12 kn | 0.9–0.9 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 11 kn on Sep 16. The highest modeled significant wave height is 2.0 m on Sep 17. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Southwest Pass right now?
As of the ECMWF IFS run 2026-09-15 12z: NNE wind 2–3 kn, waves 0.3–0.6 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 Southwest Pass?
Southwest Pass is classed as a small harbor (river natural harbor), with none shelter in the NGA World Port Index.
How deep is the approach to Southwest Pass?
Per the NGA World Port Index, the entrance channel carries about 14 m. Verify against current official charts before entry.