Swansea marine weather forecast
Swansea (GBSWA) is a port in United Kingdom at 51°38.0′N 3°58.0′W. Today (Sep 18): SW wind 22–25 kn, waves 1.9–2.3 m, from the ECMWF IFS run 2026-09-18 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 | 51°38.0′N 3°58.0′W |
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| UN/LOCODE | GBSWA |
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| Harbor size | Small |
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| Harbor type | River tide-gate harbor |
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| Shelter | Excellent |
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| Channel depth | 3 m |
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| Anchorage depth | 9 m |
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| Tide range | 6 m |
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| Pilotage | Compulsory |
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| Time zone | Europe/London |
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Facilities & services (NGA World Port Index)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Major (hull, machinery, electrical) |
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| Medical facilities | Available |
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10-day marine forecast — Swansea
| Date | Wind | Gusts | Waves |
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| SW 22–25 kn | 35 kn | 1.9–2.3 m |
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| WSW 16–24 kn | 31 kn | 1.5–2.3 m |
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| W 4–17 kn | 23 kn | 0.6–1.3 m |
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| SSW 8–11 kn | 17 kn | 0.5–0.6 m |
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| SSW 2–8 kn | 12 kn | 0.3–0.6 m |
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| WSW 5–18 kn | 22 kn | 0.3–0.9 m |
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| SE 6–21 kn | 26 kn | 0.5–1.2 m |
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| WNW 10–10 kn | 16 kn | 0.9–0.9 m |
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| SW 5–5 kn | 9 kn | 0.4–0.4 m |
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| SSE 16–16 kn | 20 kn | 0.8–0.8 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 25 kn on Sep 18. The highest modeled significant wave height is 2.3 m on Sep 18. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Swansea right now?
As of the ECMWF IFS run 2026-09-18 12z: SW wind 22–25 kn, waves 1.9–2.3 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 Swansea?
Swansea is classed as a small harbor (river tide-gate harbor), with excellent shelter in the NGA World Port Index.
How deep is the approach to Swansea?
Per the NGA World Port Index, the entrance channel carries about 3 m and anchorage depths run about 9 m. Verify against current official charts before entry.
What restricts entry to Swansea?
Entry is affected by tidal windows, overhead clearance limits. Check the live forecast on this page and official notices before approach.