Simultaneous velocity and temperature measurements in the thermal mixing layer downstream of a partially heated turbulence grid are reported. The temperature data are in good agreement with earlier results. The velocity‐temperature correlations are new and permit a systematic assessment of an earlier similarity theory for the region far downstream of the grid. By selecting the virtual origin appropriately and by reconsidering the role of scalar dissipation in that region, agreement between measurement and prediction with respect to temperature intensity and two mean lateral fluxes, that of temperature and of temperature intensity, is achieved.