The influence of the temperature of a medium on the IR absorption spectra of water dissolved in aromatic hydrocarbons was studied. It was found that the temperature of the medium substantially influences the accuracy of the determination of the quantity of dissolved water. In addition, the energy of the molecular interaction between dissolved water and an aromatic hydrocarbon was calculated on the basis of the experimental data. The results make it possible to optimize the operation of industrial spectral analyzers with the purpose of decreasing the determination error.