The Namib Desert is limited by scarce and unpredictable rainfall, only receiving an average of 19 mm per year. Fog and rainfall play a major role in the Namib Desert and these sources of moisture vary greatly from the coast inland. Rain is important for germination and establishment of the two dominant perennial plant species (Trianthema hereroensis and Stipagrostissabulicola) that then use fog water for continual growth and reproduction. These plants contribute to the majority of the floral biomass while many animals depend on them for survival. Studies of these plants and associated animal biomass were conducted in 1975, 1976, 1985 and 1991. This study used previously pioneered methods to observe changes in biomass (plants and invertebrates) and rainfall in the Namib Sand Sea over the past forty years. There has been no sampling for the last 20 years, but rainfall noticeably increased, reaching a peak in 2011 with a total of 163.6 mm, greatly influencing vegetation growth and establishment. The density and relative area in g/m² covered by plants in 2014 was high compared to previous years. The increase in vegetation cover is correlated to the increase in rainfall as well as fog, used as a supplementary moisture source. Keywords: Biomass fluctuations, Fog, Namib Desert, Namib Sand Sea, Rainfall.