Jamestown marine weather forecast
Jamestown (SHSHN) is a port in St. Helena at 15°55.0′S 5°43.0′W. Today (Sep 15): ESE wind 15–16 kn, waves 1.6–1.6 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 | 15°55.0′S 5°43.0′W |
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| UN/LOCODE | SHSHN |
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| Harbor size | Large |
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| Harbor type | Open roadstead |
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| Shelter | Poor |
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| Channel depth | 23 m |
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| Anchorage depth | 23 m |
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| Tide range | 1 m |
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| Pilotage | Advisable |
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| Time zone | Atlantic/St_Helena |
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Facilities & services (NGA World Port Index)| Supplies | Water, provisions |
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| Medical facilities | Available |
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10-day marine forecast — Jamestown
| Date | Wind | Gusts | Waves |
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| ESE 15–16 kn | 17 kn | 1.6–1.6 m |
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| ESE 18–20 kn | 22 kn | 1.7–2.4 m |
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| ESE 19–21 kn | 25 kn | 2.7–2.9 m |
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| ESE 17–18 kn | 20 kn | 2.8–3.1 m |
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| ESE 14–15 kn | 16 kn | 2.8–2.9 m |
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| SE 12–12 kn | 12 kn | 2.5–2.7 m |
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| SE 11–11 kn | 12 kn | 2.0–2.2 m |
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| SE 14–14 kn | 15 kn | 1.8–1.8 m |
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| ESE 14–14 kn | 15 kn | 2.0–2.0 m |
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| E 13–13 kn | 14 kn | 2.2–2.2 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 21 kn on Sep 17. The highest modeled significant wave height is 3.1 m on Sep 18. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Jamestown right now?
As of the NOAA GFS run 2026-09-15 18z: ESE wind 15–16 kn, waves 1.6–1.6 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 Jamestown?
Jamestown is classed as a large harbor (open roadstead), with poor shelter in the NGA World Port Index.
How deep is the approach to Jamestown?
Per the NGA World Port Index, the entrance channel carries about 23 m and anchorage depths run about 23 m. Verify against current official charts before entry.
What restricts entry to Jamestown?
Entry is affected by tidal windows, heavy swell. Check the live forecast on this page and official notices before approach.