An experimental determination of statistical properties of the interface separating turbulent fluid and contiguous nonturbulent fluid in a slightly heated plane wake, subjected to a uniform and constant rate of strain, has been made by means of digital sampling and processing techniques. The results, which comprise intermittency factor and burst rate distributions, root‐mean‐square interface slopes and probability density functions of the durations of turbulent and nonturbulent fluid, indicate that, as in the case of the unstrained wake, the interface position may be regarded as a stationary Gaussian random variable.