Thermal recovery processes used to recover heavy oil and bitumen require accurate rock and fluid data at high pressures and temperatures to properly characterize a reservoir. In high temperature processes where the temperature gradient varies with time and space important rock fluid interactions such as relative permeability are affected. This study investigates the relationship between temperature and water-oil relative permeability within a single well pair SAGD simulation model. Past literature was reviewed for water-oil relative permeability trends. A single well pair SAGD model was developed, validated, and used to test the sensitivity of the model to oil-water relative permeability curve parameters, Swi, Sor, and curvature. The gas-liquid relative permeability curvature’s effect on the model was used as a comparison. The simulator’s temperature dependent recurrent interpolation method was then tested using the same sensitivity parameters. A test using recent previously published experimental data was conducted to further consider trends and to test the interpolation method. The SAGD model was found to be more sensitive to changes in the Swi than the Sor, but the magnitude of either change was not significant. The model was found to be sensitive to the curvature as well; however, the gas-liquid curve’s curvature was much more significant. This study shows that the SAGD model is largely insensitive to changes in the oil-water relative permeability curve especially when changed recurrently. Tests using experimentally determined water-oil relative permeability curves imply that the linear interpolation method used by simulators is applicable to SAGD models. This study concludes that the water-oil relative permeability curve’s temperature dependence is not significant due to the small size of the steam chamber boundary layer which cannot be easily modelled.