It is almost rainless, yet its air is normally at or near the saturation point, and fog is very common. Inland, more continental conditions prevail, with summer temperatures reaching the upper 20's each day and dropping into the low single figures on the average winter night. This is nevertheless fairly high for a desert region. Violent weather is practically unknown. Rare thunderstorms bring the precipitation, which averages less than 2 inches annually inland, and about one-half inch at the coast.
Strong winds blow a few days a year from the interior, bringing heat and discomfort to the coast.
But storms such as characterize mid-latitude areas are totally unknown. The evenings can be cool as the winds blow across the Benguela Current sometimes forming mist and fog so remember to pack a jacket. Comfortable walking shoes are advised due to the sandy conditions. Physics Dept, University of the Witwatersrand R Adam Director, Dept.