What Exactly Is the Monsoon Retreat?
The monsoon doesn't just stop; it retreats. This withdrawal is a formal meteorological event declared by the India Meteorological Department (IMD). The process begins when the conditions that bring moisture-laden winds to the subcontinent start to reverse.
An anticyclonic circulation, which is essentially a high-pressure zone with dry, windless conditions, begins to establish itself over northwest India. For the IMD to officially declare the start of the withdrawal, it looks for specific criteria: a complete cessation of rainfall for five consecutive days, the establishment of this anticyclone in the lower atmosphere, and a significant drop in moisture levels. This process usually starts from the westernmost parts of Rajasthan, the last region the monsoon reaches, and then gradually moves southeast across the country. While the normal start date for this withdrawal is around September 17, forecasts for 2026 suggested it could be on time or even slightly early.
A Tale of Two Monsoons This Year
The 2026 southwest monsoon has been a story of stark contrasts. Early forecasts, influenced by a strengthening El Niño, predicted a below-normal monsoon season. The season started weakly, and by June, rainfall deficits were significant, causing concern for the sowing of Kharif (summer) crops. However, July saw a dramatic reversal with active low-pressure systems bringing surplus rain, which helped close the sowing gap. Despite this mid-season recovery, the overall performance has been erratic. As of early September, the country-wide rainfall deficit stood at 14% below the long-period average. This national average hides deep regional disparities: parts of central and northwest India received excess rains, while the southern peninsula and east and northeast India faced significant shortfalls. This uneven distribution, marked by long dry spells followed by intense downpours, is becoming a hallmark of India's changing weather patterns.
The Journey in Reverse
The monsoon's withdrawal is a slow, staggered journey that takes roughly six weeks to complete. After starting in Rajasthan around mid-September, the withdrawal line travels southeast, reaching central India by the end of the month and only fully retreating from the southern peninsula by mid-October. This means that on the same day, Delhi could be experiencing dry, post-monsoon weather while Kerala is still in the midst of heavy monsoon showers. For 2026, while the formal withdrawal from the northwest is expected to begin after September 15, forecasters noted a significant reduction in cloud cover across much of India in early September, signaling a weakening of monsoon activity. However, the IMD has also forecast some heavy rainfall in parts of central and northwest India through mid-September, highlighting the erratic nature of this transition period.
What the Retreat Means for Farmers
The end of the monsoon is a critical time for Indian agriculture. The rains in September are crucial for maturing Kharif crops and, more importantly, for determining the moisture in the soil for the upcoming Rabi (winter) crop season. With the IMD forecasting a drier-than-normal September for most of the country, concerns are rising. Low soil moisture can hamper the germination and growth of key winter crops like wheat, chickpeas, and rapeseed, potentially affecting yields and farmers' incomes. The 2026 season has already seen farmers contend with a weak start, and a dry finish could add further stress, especially in rain-fed agricultural zones. The reliance on groundwater pumping is expected to increase, putting pressure on both water and energy resources.
A Sign of Changing Times?
This year's erratic monsoon and the forecast for a dry September are unfolding under the shadow of a strong El Niño, a climate pattern known for suppressing monsoon rainfall in India and raising temperatures. The IMD noted that August 2026 was the warmest since 1901, a direct consequence of the El Niño effect. This is part of a larger trend where India's life-giving monsoon is becoming more unpredictable. Climate change is contributing to more extreme weather events, with prolonged dry spells and intense, short bursts of rain becoming more common. While the monsoon's arrival brings life, its departure is now a period of vigilance, as farmers and policymakers navigate the challenges of a season that is increasingly difficult to predict.
