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While the importance of El Niño to the Indian summer monsoon ( ISM) rainfall variability has been widely recognized, the role of tropical Indian Ocean ( TIO) is still unclear. Present results based on coupled model sensitivity experiments revealed that the TIO air-sea interaction trims down suppressed rainfall locally over the ISM region by opposing the influence of tropical Pacific Ocean ( TPO) during El Niño developing summers. Besides, El Niño-induced TIO basin-wide warming supports positive rainfall anomalies over the ISM region by maintaining local convection. TIO local air-sea interaction opposes the Pacific impact even in the absence of Indian Ocean Dipole. [ABSTRACT FROM AUTHOR]