The density and viscosity of aqueous solutins of triethylene glycol monomethyl ether have been measured at five temperatures in the range 25 degrees C-80 degrees C throughout the whole concentration range. Excess volume and viscosity deviation values were calculated and correlated as a function of composition. The results are compared with other data when these were available. The derived excess molar volumes, viscosity deviations, apparent molar volumes, and partial molar volumes at infinite dilution and the Grunberg-Nissan interaction energy constants are reported. The values obtained can be used to understand the nature and extent of the patterns of molecular aggregation that exist in binary (water + organic) mixtures and their sensitivity to variations in compositions, temperature, and molecular structure. Knowledge of the effect of temperature and composition on changes in the liquid density and viscosity is required in the modeling of mass transfer, heat transfer, and fluid flow.