Thermal conductivity dry out curves (TCDCs) representing the relationship between thermal conductivity and pore water saturation have been measured for two sandy soils under elevated temperatures. Experiments were conducted using an evaporative technique in a temperature-controlled oven at temperatures up to 75 degrees C for concurrent thermal conductivity, temperature, and volumetric water content measurements. Thermal conductivity of both sands at low to intermediate saturations (S similar to 0.1-0.5) increases appreciably at elevated temperature. Maximum thermal conductivity occurs at 75 degrees C and around the point of critical saturation (S-c similar to 0.1-0.13), where thermal conductivity is about twice that at room temperature (similar to 23 degrees C). This is attributed to the influence of latent heat transfer from vapor diffusion at air-water interfaces, which have a maximum surface area within this saturation regime. A new empirical model is proposed for predicting thermal conductivity dry out curves at elevated temperatures. Modeled TCDCs show good agreement with experimental results. Performance of the model is evaluated by comparison with existing models for TCDCs at elevated temperatures.