Clarkson (CACSN) — marine weather & port guide
Clarkson is a port in Canada at 43°30.0′N 79°36.0′W. Today (Aug 3): WNW wind 12–19 kn, waves 0.4–0.9 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 | 43°30.0′N 79°36.0′W |
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| UN/LOCODE | CACSN |
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| Harbor size | Very small |
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| Harbor type | Open roadstead |
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| Shelter | Fair |
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| Channel depth | 6 m |
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| Anchorage depth | 11 m |
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| Tide range | 0 m |
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| Pilotage | Compulsory |
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| Time zone | America/Toronto |
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10-day marine forecast — Clarkson
| Date | Wind | Gusts | Waves |
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| WNW 12–19 kn | 21 kn | 0.4–0.9 m |
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| WNW 4–10 kn | 12 kn | 0.1–0.3 m |
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| SE 4–7 kn | 9 kn | 0.1–0.1 m |
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| SW 4–9 kn | 16 kn | 0.1–0.2 m |
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| WNW 3–8 kn | 10 kn | 0.1–0.2 m |
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| WSW 5–8 kn | 10 kn | 0.1–0.4 m |
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| SW 12–13 kn | 16 kn | 0.3–0.4 m |
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| SSW 20–20 kn | 25 kn | 0.6–0.6 m |
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| WSW 7–7 kn | 14 kn | 0.2–0.2 m |
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| WNW 6–6 kn | 16 kn | 0.3–0.3 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 Clarkson right now?
As of the ECMWF IFS run 2026-08-03 12z: WNW wind 12–19 kn, waves 0.4–0.9 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 Clarkson?
Clarkson is classed as a very small harbor (open roadstead), with fair shelter in the NGA World Port Index.
How deep is the approach to Clarkson?
Per the NGA World Port Index, the entrance channel carries about 6 m and anchorage depths run about 11 m. Verify against current official charts before entry.
What restricts entry to Clarkson?
Entry is affected by ice, heavy swell. Check the live forecast on this page and official notices before approach.