The liquid-liquid equilibrium in the aqueous biphasic system formed by water + propan-1-ol + cesium chloride and water + propan-2-ol + cesium chloride have been determined at (298.15, 308.15, and 318.15) K. The tie lines and binodal curves as well as refractive index were measured on solutions. The LLE equilibrium experimental data were correlated using Othmer-Tobias and Bancroft correlations. The effect of temperature on the liquid-liquid equilibria was insignificantly.