The evolution of a steady, incompressible, nonisothermal submerged jet of a non-Newtonian yield/power-law fluid jet is studied using a numerical solution of the governing boundary layer equations. Emphasis is placed in studying the effects of the governing non-dimensional flow parameters i.e. the yield number, power-law index, and Prandtl number. Both yield-pseudoplastic and yield-dilatant fluids are studied for planar and axisymmetric geometries. Decay histories of the jet's center-line velocity and temperature as well as the spread of the half-width of the jets are obtained. These results show that the jet evolution, as described by the decay of the centerline velocity and evolution of the jet's half-width, becomes independent of the power-law index at higher yield numbers. The jet expansion boundary is concave to the jetaxis for all values of the power-law index for fluids that exhibit a yield stress. Moreover, the results depict the near independence of the decay of the centerline temperature from the power-law index. Also, it is established that for fluids exhibiting yield, mixing is much more rapid as compared to that of yield-stress free fluids.