Boundary layer microclimate was measured at seven locations on a representative dune in the northern Namib, using 150 mm black globe thermometers. The boundary layer microclimate offered greater temporal stability and greater spatial diversity than was evident from measurements of sand surface temperature at the same locations, and differed appreciably from the concurrent free stream microclimate, especially in having non-directional air movement with attenuated speed. Boundary layer globe temperatures, which are better indices of local heat transfer than are single microclimate parameters, correlated better than did single parameters with surface activity of Angolosaurus skoogi lizards resident on the dune. Site selection on the dune, and emergencelburying patterns, could be related to conditions prevailing in the boundary layer. Results confirmed a previous conclusion that thermoregulatory behaviour of A. skoogi, while on the dune surface, is facultative, supporting other obligatory surface activities. Keywords: Namib dune, Microclimate, Angolosaurus skoogi.