Dive visibility in Cape Town
Cape Peninsula · False Bay · Overberg
What the underwater visibility is forecast to do across Cape Town's dive sites today, tomorrow and the day after — modelled from swell and wind history, with the uncertainty stated rather than hidden.
Dive visibility in Cape Town, tomorrow (Wednesday 23 September 2026): the clearest water is forecast at Buffels Bay with a median of 9.3 m and conditions rated diveable. Across all 18 covered sites the median forecast is 6.6 m, and 15 sites are rated diveable during daylight hours. Figures are modelled estimates over daylight hours, not measurements.
Every Cape Town dive site, ranked by tomorrow's visibility
| Site | Region | Tomorrow 23 Sep | Thursday 24 Sep | Friday 25 Sep | Conditions |
|---|---|---|---|---|---|
| Buffels Bay | False Bay, inside Cape Point | 9.3 m | 9.3 m | 9.2 m | Diveable |
| Oudekraal | Atlantic seaboard, between Bakoven and Llandudno | 8.7 m | 10.1 m | 8.7 m | Diveable |
| Partridge Point | False Bay, western shore, north of Smitswinkel Bay | 7.7 m | 8.0 m | 7.7 m | Diveable |
| Clifton | Atlantic seaboard | 7.2 m | 8.8 m | 6.8 m | Diveable |
| Bakoven | Atlantic seaboard | 7.1 m | 8.4 m | 7.1 m | Diveable |
| Glencairn | False Bay, western shore, near Seaforth/Simon's Town | 6.7 m | 7.0 m | 6.8 m | Diveable |
| Roman Rock | False Bay, offshore reef near Simon's Town | 6.7 m | 6.9 m | 6.4 m | Diveable |
| Rooi Els | Overberg coast, east side of False Bay, near Gordon’s Bay | 6.5 m | 7.2 m | 5.9 m | Touch and go |
| Boulders Beach | False Bay, western shore (Simon's Town) | 6.4 m | 6.3 m | 6.4 m | Diveable |
| Cape Hangklip | Overberg coast, headland east of Pringle Bay | 6.3 m | 6.5 m | 5.5 m | Touch and go |
| Pyramid Rock | False Bay, western shore, near Miller's Point | 6.3 m | 7.0 m | 6.1 m | Touch and go |
| Castle Rock | False Bay, western shore, near Seaforth/Simon's Town | 6.2 m | 6.2 m | 6.1 m | Diveable |
| Windmill Beach | False Bay, western shore (Simon's Town) | 6.0 m | 5.4 m | 5.6 m | Diveable |
| Millers Point | False Bay, western shore | 5.9 m | 6.0 m | 5.8 m | Diveable |
| Moonlight Beach | Overberg coast, Grootbaai, east of Hangklip lighthouse | 5.8 m | 5.3 m | 4.9 m | Diveable |
| A-Frame | False Bay, western shore (Simon's Town, Oatlands Point) | 5.6 m | 5.4 m | 5.5 m | Diveable |
| Long Beach | False Bay, Simon's Town | 5.2 m | 5.1 m | 5.2 m | Diveable |
| Cosy Bay | Atlantic seaboard, Oudekraal, between Bakoven and Llandudno | 4.7 m | 5.8 m | 5.4 m | Diveable |
Median modelled visibility in metres, averaged over daylight hours. "Conditions" is the best daylight hour tomorrow, called on the weakest safety gate — entry and exit, bottom surge, current, wind or surface chop.
Forecast generated 2026-09-22 19:00 UTC. Updated every three hours.
Why Cape Town visibility is so hard to guess
Water 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, which is why an instantaneous swell forecast tells you almost nothing about what you will actually see. 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.
Cape Town also has two effectively separate oceans. The Atlantic seaboard sites — Clifton, Bakoven, Oudekraal — clean up on a southeaster that wrecks False Bay, while Simon's Town and the False Bay western shore come good on a northwester. That is why the table above regularly has excellent and unworkable sites on the same day, and why a single "Cape Town visibility" number would be meaningless.
What the numbers mean
Every figure is a median drawn from an ensemble: five wave models crossed with three weather models, carried through separately rather than averaged first. The per-site pages give the 10th–90th percentile band and the probability of diveable conditions alongside the median. A wide band means the models disagree, which is information in itself — it is the difference between "probably 8 m" and "anywhere from 3 to 14 m".
Full method, inputs and known limitations: methodology. Hourly detail and the fan chart: live forecast.
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.