Kos (GRKGS) — marine weather & port guide
Kos is a port in Greece at 36°54.0′N 27°17.0′E. Today (Aug 3): NW wind 10–15 kn, waves 0.5–0.6 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 | 36°54.0′N 27°17.0′E |
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| UN/LOCODE | GRKGS |
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| Harbor size | Very small |
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| Harbor type | Open roadstead |
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| Shelter | Poor |
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| Channel depth | 5 m |
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| Anchorage depth | 11 m |
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| Tide range | 0 m |
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| Pilotage | Advisable |
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| Time zone | Europe/Athens |
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10-day marine forecast — Kos
| Date | Wind | Gusts | Waves |
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| NW 10–15 kn | 17 kn | 0.5–0.6 m |
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| NW 11–14 kn | 18 kn | 0.5–0.7 m |
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| WNW 9–14 kn | 20 kn | 0.5–0.8 m |
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| NW 11–16 kn | 21 kn | 0.6–0.8 m |
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| NW 11–16 kn | 19 kn | 0.6–0.8 m |
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| NNW 14–15 kn | 19 kn | 0.7–0.8 m |
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| NNW 13–15 kn | 19 kn | 0.6–0.9 m |
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| NW 11–11 kn | 17 kn | 0.6–0.6 m |
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| NW 13–13 kn | 17 kn | 0.7–0.7 m |
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| WNW 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.
Frequently asked
How is the weather at Kos right now?
As of the ECMWF IFS run 2026-08-03 12z: NW wind 10–15 kn, waves 0.5–0.6 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 Kos?
Kos is classed as a very small harbor (open roadstead), with poor shelter in the NGA World Port Index.
How deep is the approach to Kos?
Per the NGA World Port Index, the entrance channel carries about 5 m and anchorage depths run about 11 m. Verify against current official charts before entry.