Temperature fields were taken in a film cooling lateral injection configuration with pitch-to-hole-diameter of 3.0. These measurements were done with a traversing therrnocouple. Momentum flux ratios of 0.25, 1.0 and 2.25 were used. Results are presented as fields of dimensionless temperatures, given by 0 Tprobe-T Near-surface values of this quantity over an Tc-T unheated surface are adiabatic effectiveness values. Streamwise evolutions of these temperature fields are documented. It is seen how with higher blowing ratio the film cooling jets tend to lift off the surface. Comparisons are made to previous data and computational results. It is verified that lateral injection yields a more uniform distribution of effectiveness immediately downstream of injection. It is shown also how interaction of adjacent film cooling jets leads to such improved uniformity. This interaction depends on the pitch to diameter ratio, P/D. In order to study the effect of this parameter, additional data with P/D = 6.0 are presented. The present thermal field data complement previous velocity field measurements taken in the same flow.