Overberg coast dive visibility forecast
Overberg coast · Western Cape
Rooi Els, Cape Hangklip and Moonlight Beach sit on the eastern side of False Bay, an hour and a half from the city. They are dived almost entirely by Cape Town divers but they are not in Cape Town, and they run on a different swell window from the peninsula.
Overberg coast dive visibility, tomorrow (Wednesday 2 September 2026): the clearest water is forecast at Moonlight Beach with a median of 3.7 m and conditions rated not diveable. Across the 3 covered Overberg coast sites the median forecast is 3.4 m, and 0 are rated diveable during daylight hours. Figures are modelled estimates, not measurements.
Overberg coast dive sites, ranked by tomorrow's visibility
| Site | Today 1 Sep | Tomorrow 2 Sep | Thursday 3 Sep | Conditions |
|---|---|---|---|---|
| Moonlight Beach | 3.9 m | 3.7 m | 1.6 m | Not diveable |
| Cape Hangklip | 3.7 m | 3.3 m | 1.5 m | Not diveable |
| Rooi Els | 3.4 m | 3.1 m | 2.0 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 Overberg coast
The eastern shore is sheltered from the southeaster that closes out the western side, which is why it is often the only workable option in summer.
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.