A steady laminar boundary layer flowing along a vertical plate immersed in a Darcy-Brinkman porous medium saturated with water at 4A degrees C is studied. The plate temperature varies sinusoidally along the plate between 0 and 8A degrees C where the density of water varies parabolically and is almost symmetrical at about 4A degrees C. Except for the existence of the buoyancy force, it is assumed that either the plate moves upwards or the ambient water moves upwards (moving stream). The results are obtained with the direct numerical solution of the boundary layer equations taking into account the temperature dependence of water thermophysical properties (rho, mu and c (p)). Results are presented for the wall temperature gradient and the wall shear stress along the plate for free convection and mixed convection. Temperature and velocity profiles are also presented.