The South African Weather Service (SAWS) maintain a number of coastal Automatic Weather Stations (AWS) around the South African coast, which monitors wind speed and direction, rainfall, air temperature and humidity. The oldest records from some of these stations extend back to January 1989, with newer stations deployed where and when the need arises. A map of the available coastal AWS stations can be seen below.
Sea surface temperature data is collected daily by voluntary observers in discrete locations (link to webpage), at the interface of the sea surface with the atmosphere.