Cape Peninsula, South Africa

Forecast the water, not just the weather.

theviz is a probabilistic water-clarity forecast for named dive sites across the Cape Peninsula, False Bay and the Overberg coast.

What it does

theviz estimates underwater visibility from several days of swell and wind history, then carries multiple weather models and plausible site parameters through the calculation. It presents a median estimate, an 80% range and the chance of clearing a chosen visibility threshold rather than one falsely precise number.

What it covers

The service currently covers 18 named shore and nearshore sites from Clifton and Bakoven on the Atlantic seaboard to Cape Hangklip and Moonlight Beach on the Overberg coast. See the coverage list.

Use it responsibly

A visibility forecast is not a dive plan, a weather warning service or navigation advice. Conditions can change quickly and local hazards, access, currents, marine protected-area rules and personal limits always matter. Inspect the site and make conservative decisions on the day.

Why the forecast has memory

Water clarity is often a lagging condition: the sea can look calm after a swell while sediment remains suspended. theviz models this settling behaviour, which is why it can be more useful for visibility planning than a single current swell reading.