Reinforced concrete (RC) coastal structures are susceptible to premature deterioration due to various reasons accelerated by influencing climate change. It is thus crucial to determine their residual life to improve their strength and prolong their service life. The present study explores the effect of change in atmospheric parameters (relative humidity and temperature), structural parameters (clear cover, water cement ratio) and exposure conditions using the chloride ingress model and crack model. The analysis is performed using the above two models coupled with the Monte Carlo method and long-term study of RC block specimens. Findings from the analysis highlights that, time for corrosion initiation decreased with an increase in temperature, relative humidity and water cement ratio (w/c); time for crack formation of allowable width is found to be approximately 2 years which depends on the structural parameters and exposure conditions. The probabilistic analysis revealed that 90% to 99% of the structures in different exposure conditions are experiencing early deterioration compared to a condition of no climate change. The study also adopts a nomograph approach to find the chloride concentration and corrosion initiation time for different w/c ratios, and threshold chloride to surface chloride concentration ratios.