Provided is a temperature-responsive hygroscopic material having a hygroscopic property that varies widely according to temperature variation and a method for producing the temperature-responsive hygroscopic material. The temperature-responsive hygroscopic material includes a mesoporous body having an average pore diameter of 2 nm to less than 50 nm and a temperature sensitive molecule chemically bonded with the mesoporous body inside a pore of the mesoporous body. The method includes a step of causing, in a solvent including an activator and a coupling agent, a coupling reaction of: a mesoporous body having an average diameter of 2 nm to less than 50 nm and having a functional group on a surface thereof; and a temperature sensitive molecule having a functional group which can undergo a coupling reaction with the functional group on the surface of the mesoporous body.