Caernarvon marine weather forecast
Caernarvon (GBCNV) is a port in United Kingdom at 53°9.0′N 4°16.0′W. Today (Nov 2): NE wind 11–14 kn, waves 0.4–0.6 m, from the ECMWF IFS run 2026-11-02 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 | 53°9.0′N 4°16.0′W |
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| UN/LOCODE | GBCNV |
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| Harbor size | Small |
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| Harbor type | River basin harbor |
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| Shelter | Good |
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| Anchorage depth | 5 m |
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| Tide range | 5 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)| Supplies | Diesel, water, provisions |
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| Repairs | Limited |
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| Medical facilities | Available |
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10-day marine forecast — Caernarvon
| Date | Wind | Gusts | Waves |
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| NE 11–14 kn | 19 kn | 0.4–0.6 m |
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| NE 12–14 kn | 19 kn | 0.5–0.6 m |
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| ENE 13–14 kn | 23 kn | 0.6–0.7 m |
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| E 13–16 kn | 21 kn | 0.5–0.7 m |
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| E 5–11 kn | 16 kn | 0.2–0.5 m |
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| ENE 3–4 kn | 6 kn | 0.1–0.2 m |
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| E 3–6 kn | 8 kn | 0.1–0.3 m |
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| E 13–13 kn | 20 kn | 0.6–0.6 m |
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| E 9–9 kn | 23 kn | 0.7–0.7 m |
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| ENE 11–11 kn | 19 kn | 0.7–0.7 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 16 kn on Nov 5. The highest modeled significant wave height is 0.7 m on Nov 4. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Caernarvon right now?
As of the ECMWF IFS run 2026-11-02 12z: NE wind 11–14 kn, waves 0.4–0.6 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 Caernarvon?
Caernarvon is classed as a small harbor (river basin harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Caernarvon?
Per the NGA World Port Index, anchorage depths run about 5 m. Verify against current official charts before entry.
What restricts entry to Caernarvon?
Entry is affected by tidal windows, overhead clearance limits. Check the live forecast on this page and official notices before approach.