Example temperature compensation circuits and a phased array apparatus are described. One example temperature compensation circuit is applied to a signal processing path. The example temperature compensation circuit includes a temperature detection circuit, a temperature conversion circuit, and a passive variable attenuator. The passive variable attenuator is configured to be connected in series in the signal processing path. The temperature detection circuit is configured to generate a temperature signal and a reference signal, and output the temperature signal and the reference signal to the temperature conversion circuit. The temperature signal monotonically changes with a temperature of the signal processing path. The temperature conversion circuit is configured to generate a control signal based on the temperature signal and the reference signal. The passive variable attenuator is configured to adjust, under control of the control signal, an attenuation value of a signal processed by the signal processing path.