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The subtropical highs are semi-permanent atmospheric features that strengthen during April–September, exerting a large influence on regional rainfall^{, , , –}. Previous studies have focused on the changes of subtropical highs during their peak season (June–August)^{, –}, but little is known about their changes in other seasons. Here, a suite of multi-model simulations are used to demonstrate the robust seasonally dependent responses of subtropical highs and tropical rainfall to anthropogenic warming. The zonal-mean subtropical highs in the Northern Hemisphere are shown to strengthen more during April–June than July–September, with opposite responses for the Southern Hemisphere counterparts. These responses are closely related to a southward shift of tropical rainfall in April–June relative to July–September, manifesting in a seasonal delay of tropical rainfall and monsoon onset in the Northern Hemisphere …