Atlantic seaboard dive visibility forecast
Cape Town · Western Cape
The Atlantic seaboard — Clifton, Bakoven, Oudekraal, Cosy Bay — is cold, clear kelp-forest diving on its day. It is fully exposed to the Atlantic swell, so it lives or dies on how hard the last few days have stirred the bottom.
Atlantic seaboard dive visibility, tomorrow (Wednesday 2 September 2026): the clearest water is forecast at Oudekraal with a median of 4.9 m and conditions rated not diveable. Across the 4 covered Atlantic seaboard sites the median forecast is 3.5 m, and 1 is rated diveable during daylight hours. Figures are modelled estimates, not measurements.
Atlantic seaboard dive sites, ranked by tomorrow's visibility
| Site | Today 1 Sep | Tomorrow 2 Sep | Thursday 3 Sep | Conditions |
|---|---|---|---|---|
| Oudekraal | 5.8 m | 4.9 m | 3.3 m | Not diveable |
| Cosy Bay | 4.0 m | 3.4 m | 1.8 m | Diveable |
| Bakoven | 4.0 m | 3.2 m | 2.3 m | Not diveable |
| Clifton | 3.4 m | 2.5 m | 1.6 m | Not diveable |
Median modelled visibility in metres, averaged over daylight hours. "Conditions" is the best daylight hour, called on the weakest safety gate.
Forecast generated 2026-09-01 10:04 UTC. Updated every three hours.
The wind that governs the Atlantic seaboard
A sustained southeaster blows offshore here and upwells cold, clean water: the wind that ruins False Bay is the one that makes the Atlantic side.
Clarity here is a lagging quantity: it is set by how hard the bottom has been stirred over the preceding days and how long the silt has had to drop out again, not by the swell in front of you right now. theviz reads six days of swell and wind history at each site, runs it through bottom-stirring physics and lets it settle three days forward, carrying five wave models crossed with three weather models through separately so the output is a distribution rather than a single number.
How to read these figures
Each number is the median of the modelled ensemble over daylight hours — half the members came out clearer, half murkier. The per-site pages add the 10th–90th percentile band and the probability of diveable conditions. A wide band means the weather models disagree about the swell or wind that will stir the bottom, which is information in itself: it is the difference between "probably 8 m" and "anywhere from 3 to 14 m".
"Diveable" is called on the weakest safety gate — entry and exit, bottom surge, current, wind or surface chop — and is independent of clarity. A site can have beautiful water and still be undiveable because the entry is unworkable.
theviz forecasts water clarity from swell and wind history. It does not measure it, and it is not navigation or dive-safety advice. Conditions change fast; check locally, dive within your training, and verify marine protected-area boundaries before spearfishing.