I find Windguru to be quite accurate but only from around four days out. Check Muizenberg https://www.windguru.cz/131594 and Cape Point https://www.windguru.cz/128493 They should start showing CTCT Sunday later today and watch how it changes over the next week. This weekend is looking good. Roads are going to be humming. Watch out for homicidal pensioner motorists in Fish Hoek and the grumpy locals on Chappies