Convection, production, diffusion, and dissipation of temperature fluctuations have been measured in the dynamically similar turbulent wake behind an optically heated sphere 136 sphere diameters downstream and at a Reynolds number 4300. The measurements show strong convection and dissipation and moderate diffusion and production. In addition, the dependence of one‐dimensional spectra of temperature fluctuations on wake parameters, intermittency, and the skewness of temperature and velocity derivatives have been measured in a Reynolds number range 1000‐38 000. The skewness of temperature derivative exhibits locally nonisotropic behavior especially at low Reynolds numbers.