Saint John's marine weather forecast
Saint John's (AGSJO) is a port in Antigua & Barbuda at 17°7.0′N 61°51.0′W. Today (Sep 15): ENE wind 15–16 kn, waves 1.4–1.6 m, from the NOAA GFS run 2026-09-15 18z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 17°7.0′N 61°51.0′W |
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| UN/LOCODE | AGSJO |
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| Harbor size | Medium |
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| Harbor type | Open roadstead |
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| Shelter | Fair |
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| Channel depth | 9 m |
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| Anchorage depth | 16 m |
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| Tide range | 0 m |
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| Pilotage | Compulsory |
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| Time zone | America/Antigua |
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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 | Limited |
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| Medical facilities | Available |
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10-day marine forecast — Saint John's
| Date | Wind | Gusts | Waves |
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| ENE 15–16 kn | 18 kn | 1.4–1.6 m |
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| ESE 16–19 kn | 22 kn | 1.7–2.0 m |
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| E 14–18 kn | 20 kn | 1.7–1.9 m |
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| E 10–13 kn | 14 kn | 1.2–1.5 m |
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| ESE 7–9 kn | 10 kn | 1.1–1.2 m |
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| ESE 9–9 kn | 9 kn | 1.0–1.0 m |
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| ESE 11–11 kn | 12 kn | 0.9–0.9 m |
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| E 13–13 kn | 14 kn | 0.9–0.9 m |
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| SE 7–7 kn | 8 kn | 1.1–1.1 m |
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| ESE 12–12 kn | 13 kn | 1.6–1.6 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 19 kn on Sep 16. The highest modeled significant wave height is 2.0 m on Sep 16. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Saint John's right now?
As of the NOAA GFS run 2026-09-15 18z: ENE wind 15–16 kn, waves 1.4–1.6 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 Saint John's?
Saint John's is classed as a medium harbor (open roadstead), with fair shelter in the NGA World Port Index.
How deep is the approach to Saint John's?
Per the NGA World Port Index, the entrance channel carries about 9 m and anchorage depths run about 16 m. Verify against current official charts before entry.
What restricts entry to Saint John's?
Entry is affected by heavy swell. Check the live forecast on this page and official notices before approach.