Ocean currents of the world have significant influence on climate particularly on rainfall and temperature. Warm ocean currents raise the temperature of winds blowing over them which in turn raise temperatures of adjacent coast lands. The East African coast is washed by the warm Mozambique current and this, in addition to latitude, further explains why the East African coast and the adjacent coast lands are hot.

Map of Africa showing main Ocean Currents

Similarly coasts such as Natal (Republic of South Africa) and Western Europe which are washed by the warm Mozambique Current and the North Atlantic Drift respectively have relatively high temperatures and rainfall. Conversely, coasts washed by cold currents such as South West Africa and California (where the Benguela and California currents flow respectively) have low rainfall and temperatures.
The two types of Ocean currents are: -Warm and Cold currents.