There is a large amount of data in the literature describing the temperature effects on the dielectric and piezoelectric constants of barium titanate. This paper, however, describes the temperature effects on the admittance of barium titanate transducers operating near resonance. Both pure and leaded ceramic mixtures are compared over the 0°–20°C temperature range. Despite extreme fluctuations of the dielectric and piezoelectric constants over this temperature range, it is possible at a certain frequency near resonance for both the transducer conductance and susceptance to vary very little with temperature. Air and water admittance circle diagrams, sensitivity‐frequency, and efficiency curves—all plotted against temperature—are presented and analyzed from an equivalent circuit point of view. One of the significant conclusions derived from this experiment is that the radiated power of a transmitting transducer, properly matched to its source at this optimum frequency, will remain maximized regardless of the temperature variation. While the barium titanate temperature effects were studied for given underwater transducers, the information outlined is of value to anyone encountering temperature variations in a resonant barium titanate ceramic.