Knowledge on Indian winter monsoon variability is limited, and Sri Lanka provides an ideal location to study the behavior of both summer and winter monsoon-driven precipitations. Hence, marine multi-proxy records from the Indian summer monsoon-dominated and winter monsoon-dominated areas in Sri Lanka were constructed to compare and contrast precipitation variability over the last 6000 years. We utilized marine sediments from two coastal locations: Negombo, influenced by the Indian Summer Monsoon, and Pulmoddai, influenced by the Indian Winter Monsoon. Overall, the strength of rainfall signals at Negombo shows a weakening over the past 4000 years, significantly in the past 2000 years, whereas at Pulmoddai, these signals have shown a gradual intensification. A southward shift of the rain belt called the Intertropical Convergence Zone (ITCZ) likely caused those changes in summer and winter monsoon precipitations . This shift happened because the Northern Hemisphere became cooler during a time when the Earth's position in its orbit (precession cycle) reduced the amount of sunlight it got in the summer.