The problem regarding the change in thermal properties has come to occupy an important position in understanding various types of weathering. The present research pursues the evaluation of changes in specific heat capacity and volumetric heat capacity during rock weathering from a different angle. Two relationships for evaluating the changes of specific heat capacity and volumetric heat capacity in rock weathering have been derived theoretically from the values of some physical properties. The changes of specific heat capacity and volumetric heat capacity in rock during natural weathering are evaluated on the basis of the available data of densities, specific gravity, and water content in weathering profile.