Due to increased adoption of IoT devices, Physically Unclonable Function (PUF) circuits are essential as a security primitive. However PUFs suffer from imperfect reliability due to environmental variation. In this paper, we propose a PUF-server paradigm in which the server hosts the PUF’s temperature model, and the PUF informs the server of its temperature. Simulations show model-based reliability improving to 97.9%-99.5% compared with conventional reliability of 83.9%-86.3%. Conversely, 25%-40% of CRPs are invalid in conventional case, compared with no loss with the proposed model. These results are also shown to be robust against quantization errors of a temperature sensor.