India’s September monsoon rainfall in 2026 is on track to end below normal, with the India Meteorological Department (IMD) flagging signs of an early withdrawal that could leave the season closing on a noticeably dry note. That matters because September is when the four-month monsoon usually tapers off, and how it tapers decides whether reservoirs, sowing numbers, and even festive-season retail footfall stay on script.
Key Takeaways
- IMD’s outlook points to below-normal to normal September monsoon rainfall for large parts of central and northwest India this year.
- Withdrawal from western Rajasthan could begin close to the usual mid-September window, but the pace afterward looks quicker than the last two seasons.
- Kharif crops in their final growth stage — pulses, oilseeds, cotton — are the most exposed if rain cuts off too early.
- Reservoir levels going into October will shape both irrigation and, indirectly, festive-season consumer spending in rural markets.
What Has IMD Said About September Monsoon Rainfall in 2026?
IMD’s monthly bulletin for September has classified rainfall for the month as likely to be normal to below normal across a broad stretch of the country, with pockets of northwest and central India seeing the sharper shortfall. The agency has been careful with its phrasing — it isn’t calling this a “monsoon failure,” just a season that ends quieter than it began.
That distinction matters. June and July delivered healthy, sometimes surplus, rainfall in several basins. It’s specifically the tail end — the last three to four weeks of the season — where forecasters expect the numbers to soften.
Why Is the Monsoon Withdrawing Early This Year?
Monsoon withdrawal is governed by a mix of factors: the strength of the subtropical ridge, sea surface temperatures in the Bay of Bengal and Arabian Sea, and how quickly a dry, northerly wind pattern sets up over Rajasthan. This year, weather agencies have pointed to weakening moisture feed from the Bay of Bengal combined with a comparatively neutral Pacific Ocean state — no strong El Niño or La Niña pulling the system one way or the other.
Without a strong La Niña to sustain late-season rain bands, the monsoon trough tends to retreat faster once it starts pulling back. That’s essentially the mechanism IMD scientists have described in recent briefings, even if they’ve stopped short of giving an exact withdrawal date this early.
How Does Withdrawal Timing Normally Work?
Under IMD’s revised normal dates, withdrawal from western Rajasthan usually begins around 17 September, and the monsoon fully exits the country by around 15 October. Anything meaningfully ahead of that schedule counts as an early withdrawal, and anything that lingers past it counts as delayed.
Which States Will Feel the Dry September Rainfall Most?
Based on current signals, the states most likely to record a rainfall deficit this September are Rajasthan, Gujarat, Madhya Pradesh, and parts of Maharashtra’s Vidarbha and Marathwada belts. Eastern India and the northeast, by contrast, could still see intermittent heavy spells from residual low-pressure systems moving in from the Bay of Bengal.
| Rainfall Category | % of Long Period Average (LPA) |
| Deficient | Below 90% |
| Below Normal | 90% to 96% |
| Normal | 96% to 104% |
| Above Normal | 104% to 110% |
| Excess | Above 110% |
These are IMD’s standard classification bands, used every season to judge whether a month’s rainfall was on target. For September 2026, most forecasts so far cluster in the “below normal” to “normal” zone rather than anything sharply deficient — a mild letdown rather than a crisis, at least on current trends.
How Does a Dry September Affect Kharif Crops and Reservoirs?
September rain is often what fills the gap for late-sown kharif crops — soybean, cotton, tur (pigeon pea), and groundnut — right before harvest. A dry September stresses pods and grain-fill stages, even if June-August rainfall was adequate. Farmers in Madhya Pradesh and Maharashtra, both major soybean and cotton belts, are watching this closely.
Reservoir storage is the other pressure point. Central Water Commission data typically shows reservoirs topping up through August and early September; if the tail-end rain doesn’t arrive, storage going into the dry months takes a hit, which then affects rabi-season irrigation planning from November onward. You can track live storage and rainfall bulletins directly on the India Meteorological Department’s website, which updates its seasonal outlook through the month.
The Retail Angle: Why a Dry September Also Rewrites Marketing Calendars
I’ve spent enough years around my family’s retail business to know that rain isn’t just a farming story — it’s a footfall story. A wet September usually slows down street-level shopping and outdoor advertising impact in tier-2 towns, while a dry, early-withdrawal September tends to pull shoppers back onto the streets right as festive-season campaigns start warming up.
Brands that plan hyperlocal, weather-responsive marketing — shifting spends between out-of-home, e-commerce, and in-store push based on real rainfall data — are the ones who benefit most from a season like this. It’s a small, practical example of how something as unglamorous as September monsoon rainfall data quietly shapes ad budgets weeks later.
FAQ
Will India get less rain in September 2026?
Current IMD signals suggest September monsoon rainfall will likely be normal to below normal for much of central and northwest India, though not sharply deficient nationwide.
When does the monsoon usually withdraw from India?
Withdrawal typically begins from western Rajasthan around 17 September and is complete across the country by around 15 October, per IMD’s updated normal dates.
Which crops are most at risk from a dry September?
Late-stage kharif crops like soybean, cotton, tur, and groundnut are most sensitive, since September rain often supports their final grain-fill and pod-development stages.
Does a dry September mean drought?
Not necessarily. A below-normal or early-withdrawal September mainly affects the tail end of the season; overall monsoon performance depends on the full June-September total.
How does September rainfall affect reservoir levels?
Reservoirs typically get a late top-up in September; if that rain doesn’t arrive, storage going into the dry season stays lower, affecting irrigation and drinking water planning through winter.
Conclusion
September monsoon rainfall in 2026 looks set to close the season on a quieter, drier note than the year started with, though IMD isn’t calling it alarming yet. The real test over the next few weeks is how fast withdrawal moves once it begins, and whether kharif crops and reservoirs get one last useful spell before the taps turn off.