This study aimed to achieve two key objectives: first, to develop an advanced temperature simulator capable of predicting gas hydrate dissociation, and second, to evaluate the impact of this dissociation on wellbore stability. The simulator was designed based on fundamental heat transfer principles (such as Fourier’s law), pressure-volume-temperature (PVT) relationships governing gas hydrates, and the Mohr-Coulomb failure criterion for assessing wellbore stability. The methodology involved simulating various gas hydrate dissociation scenarios using the developed temperature simulator and analyzing their effects on wellbore stability. The simulator incorporated variations in drilling fluid temperature and pressure conditions to closely replicate offshore drilling environments. The findings revealed that gas hydrate dissociation, triggered by drilling activities below the mudline, significantly compromises wellbore stability. This effect is particularly pronounced in high-pressure, low-temperature environments, where hydrate dissociation leads to a substantial reduction in sediment shear strength, increasing the risk of wellbore failure. The novelty of this study lies in the integration of temperature simulation with wellbore stability assessment, providing a more comprehensive understanding of gas hydrate behavior and its implications for drilling operations. This approach enhances the predictability of hydrate dissociation effects, ultimately contributing to safer and more efficient drilling practices in hydrate-rich offshore regions. In conclusion, the study emphasizes the critical role of temperature simulation in understanding gas hydrate behavior beneath the mudline. It highlights the necessity of incorporating hydrate dynamics into drilling plans to ensure wellbore stability and mitigate potential risks during offshore operations.