Wind Guru
The best wind resource I’ve found is Wind Guru, their Cape Town summary has Wind direction and speed as well as Swell direction, size and period for Cape Town. Click here to check it out.
Wind Finder
For for Windsurfers and Kiters, but the image below is a very useful graphic of what the wind is doing around the Cape.
www.windfinder.com The full page with the current wind details for Cape Town can be found here: http://www.windfinder.com/windreports/windkarte_za.htm