How to explain the differences in climate of the coasts of the Indian and Atlantic oceans of South Africa?

The transfer of air masses in tropical latitudes is directed from SE to NW, that is, winds prevail eastward (trade winds), just from the Indian Ocean to the east coast of South Africa.
West coast – the wind pattern is the same, but from the coast of Africa deeper into the Atlantic Ocean, the cold current contributes to the formation of precipitation in the form of fog and dew

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