The Retreating Monsoon Explained: Why It Takes Weeks, Not Days | RainViewer Blog

TL;DR: The Southwest Monsoon does not end on a date. It withdraws across India over roughly six weeks. Withdrawal starts in northwest India, usually around Rajasthan, in early September The line moves southeast, reaching Kerala and Tamil Nadu only by mid-October in a typical year Delhi can be post-monsoon while Kerala is still in full monsoon on the same day The India Meteorological Department declares withdrawal on meteorological criteria, not the calendar A brief return of southwest flow can stall or reverse the retreat in one region The Southwest Monsoon doesn’t end on a single date across