Johannesburg’s southern latitude sets it in a subtropical zone, with a mix of high and low temperatures, and varying precipitation. The cold Benguela current makes for moderate temperatures on the west coast, and lots of precipitation during the summer months. Before you book your flight to Johannesburg, be aware that the seasons in the Southern Hemisphere are in opposition to the northern Hemisphere, so the seasons go as follows: Spring (September, October, November); Summer (December, January, February), Autumn (March, April May), Winter (June, July, August).