The onset of monsoon plays an important role in controlling the climatic variability over India. About 80% of the rainfall during monsoon periods (June-September, JJAS) shows strong variability, some regions suffer with major floods and others suffer with severe droughts. We have considered eight-grid boxes (2°x2°) in coastal and Himalayan states for detailed analysis of rainfall and water vapor data retrieved from satellite for the periods 2003-2018. The rainfall deficit years 2004 and 2005, 2007 and 2013 excess rainfall years and 2008 and 2010 years of normal rainfall are considered. From detailed analysis, we observed that the coastal states as well as Himalayan states show wet and dry periods at every 4-5 years cycle, the rainfall amount was more than two times compared to the coastal regions. Monsoon pattern in Himalayan region is complex due to interaction of topography and other physical parameters. In the western Himalayan region, the amount of rainfall varies over west to central Himalaya. In plains, the water vapor content increases as compared to the coastal regions, which could be due to the existing and increasing anthropogenic activities. A strong relationship between water vapor and rainfall in north and northeastern parts of India, while weak relationship for coastal regions have been observed. The water vapor content in coastal region shows a time lag of 4-5 days with respect to rainfall. Detailed analysis will be discussed to show dependence of the Indian Summer Monsoon on the strong coupling between land-ocean-atmosphere that leads to inter-decadal variability in climatic conditions.