Landslides are sudden and often destructive movements of rock, soil, and debris down a slope, which pose a significant threat to both human lives and infrastructure. These natural disasters are typically triggered by various factors, with rainfall being a prominent and recurrent catalyst. In regions such as the Nilgiris, characterized by heavy and erratic rainfall, landslides are a recurring concern. This project focuses on comprehensively understanding the intricate connection between rainfall and slope stability in the Nilgiris district, with specific attention given to Kateri region. The study involves the characterization of soil samples collected from two locations and the analysis of five years of rainfall data from 2019 to 2023, highlighting the occurrence of intense rainfall during the months of June to August in the region. The evaluation employs PLAXIS 2D finite element method (FEM) to assess the stability of slope. The analysis was done with the maximum rainfall of 115 mm in the region. Porewater pressures measured at the sites are 100 kPa and 42.74 kPa, respectively, while displacement measurements are respectively 0.195 m and 0.406 m. The findings emphasize that an increase in pore pressure is a contributing factor to the reduction in soil shear strength, ultimately leading to slope failure. It is also evident from the significant movement of soil that the slope had failed. Moreover, this study enhances its depth by incorporating two different slope angles of 45 and 55° to understand the modes of failure.