This work explores the potential of high-speed infrared (IR) thermography to analyze a turbulent water boundary layer in submerged jet flows. In the experiments, the IR camera (FLIR Systems SC7700) is focused on the inner side of an IR-transparent vessel window, providing high-speed (100 Hz) recordings of heat fluxes from a thin water layer close to the window. The temperature variations are shown to act as a passive tracer in the considered turbulent flows. The power spectra of the turbulent fluctuations are calculated for different points in the near-surface flows and compared to the existing theoretical turbulence models.