Himachal Pradesh, a state of India, witnesses numerous landslides every year due to extreme atmospheric events. The present study has been done to evaluate the effect of rainfall on triggering landslide that happened on 7th August 2013 in the outer Himalayas near the Tira Line locality of Dharamshala, India. In the present study, the slope has been investigated through numerical modeling. Degree of saturation and water pressure is calculated at the different intensities of rainfall at different time intervals. Reviewing the outcome indicates the loss of shear strength because of increased pore water pressure as a consequence of high infiltration due to prolonged episode of rainfall in monsoon. The findings support the theory that slope failure was caused by a continual rise in the water saturation level.