The 'little boy' in the Pacific, India's monsoon and the big test ahead

India's 2026 southwest monsoon season has begun with a significant rainfall deficit, with below-normal precipitation recorded across large parts of central I...

What Happened

India's 2026 southwest monsoon season has begun with a significant rainfall deficit, with below-normal precipitation recorded across large parts of central India, raising alarm for the Kharif crop cycle.
Sowing of key rain-fed crops — paddy (rice) and oilseeds — has been delayed compared to the five-year average, particularly across central Indian states that are heavily dependent on monsoon rains.
The El Niño phenomenon in the equatorial Pacific is strengthening, adding scientific uncertainty to the monsoon outlook for the remainder of the June–September season.
Agricultural economists warn that delayed sowing compresses the crop growth window, increasing susceptibility to dry spells later in the season and reducing yield potential.
The combination of a monsoon deficit and El Niño conditions is being closely tracked for its potential to push food inflation higher through the second and third quarters of FY27.

Static Topic Bridges

El Niño–Southern Oscillation (ENSO) and the Walker Circulation

El Niño–Southern Oscillation (ENSO) is a coupled ocean-atmosphere phenomenon in the tropical Pacific Ocean. Peruvian fishermen historically named the warm coastal current that appears around Christmas "El Niño" (the Christ Child). The atmospheric counterpart — Southern Oscillation — was identified by Sir Gilbert Walker while he was Director General of Indian Observatories (early 20th century), who noticed an inverse pressure seesaw between Darwin (Australia) and Tahiti (Pacific).

The mechanism rests on the Walker Circulation — the equatorial overturning cell that normally ascends over the warm western Pacific and descends over the cooler eastern Pacific. Under neutral/La Niña conditions, easterly trade winds blow warm surface water westward, maintaining this circulation. During El Niño, trade winds weaken or reverse (Bjerknes feedback, named after Jacob Bjerknes who formulated the coupled ocean-atmosphere theory in 1969), warm water surges eastward, the Walker Circulation weakens, and the atmospheric moisture patterns shift globally.

El Niño: warming of central and eastern equatorial Pacific sea surface temperatures (SSTs) ≥0.5°C above normal for five consecutive overlapping three-month periods.
La Niña: the opposite phase — cooling of eastern Pacific SSTs, stronger trade winds, enhanced Walker Circulation.
ENSO is monitored through the Niño 3.4 index (SST anomaly in 5°N–5°S, 120–170°W region).
The 2015-16 and 1997-98 El Niño events are the two strongest on record, with SST anomalies exceeding 2.5°C above normal.
The current 2026 El Niño event is forecast at 80% probability for June–August 2026 (WMO), with SST anomalies expected to exceed 2°C in key monitoring regions, potentially making it at least "moderate to strong."

Connection to this news: A strengthening El Niño is the primary planetary-scale driver of the 2026 monsoon deficit. El Niño weakens the temperature gradient that drives Indian Ocean moisture toward the subcontinent, reducing monsoon intensity.

El Niño's Mechanism of Impact on India's Monsoon

India's southwest monsoon is driven by the differential heating between the Indian landmass and the Indian Ocean, which creates a pressure gradient drawing moisture-laden winds northward. El Niño disrupts this in two interconnected ways:

Suppressed Bay of Bengal convection: El Niño shifts the equatorial convection zone eastward (toward the central Pacific), reducing the convective activity over the Bay of Bengal that normally feeds the monsoon.
Weakened cross-equatorial flow: The temperature gradient driving winds from the southern Indian Ocean across the equator is reduced, weakening the monsoon "cross-equatorial jet."

Historical correlation: of 16 El Niño events since 1950, five led to extreme droughts in India. Major droughts in 1972, 1982, 1987, 2002, and 2009 all occurred during El Niño years.
However, El Niño does not guarantee drought — the Indian Ocean Dipole (IOD) can partially counteract El Niño's suppressing effect when the IOD is in a positive phase (warmer western Indian Ocean).
IMD classifies rainfall below 90% of LPA as deficient — the threshold for drought declaration processes.
Central and peninsular India are most vulnerable to El Niño-driven deficits; the northwest and northeast have different teleconnections.

Connection to this news: Delayed paddy and oilseed sowing in central India in 2026 is a direct early-season signal consistent with El Niño suppression of monsoon activity over the central Indian rainfall belt.

Indian Ocean Dipole (IOD) — El Niño's Counterweight

The Indian Ocean Dipole (IOD) is an irregular oscillation of sea surface temperatures between the western and eastern Indian Ocean. It operates somewhat independently of ENSO and can either amplify or dampen El Niño's effects on the Indian monsoon.

Positive IOD: Western Indian Ocean is warmer than eastern Indian Ocean. Brings above-normal rainfall to India and parts of East Africa. Can partially cancel out El Niño's drying effect.
Negative IOD: Eastern Indian Ocean is warmer. Suppresses Indian monsoon rainfall, and when combined with El Niño, produces the most severe deficits.
IOD anomalies typically develop in June–August and peak in September–November.
The 2019 monsoon was a notable case where a strong positive IOD more than offset a moderate El Niño, delivering above-normal rainfall despite El Niño conditions.

Connection to this news: Forecasters and the IMD will be closely monitoring the IOD phase developing through mid-2026. A positive IOD could mitigate El Niño's negative monsoon impact; a neutral or negative IOD would compound the deficit risk.

Kharif Crop Calendar and Sowing Window Significance

India has two principal cropping seasons determined by monsoon timing. The Kharif season (rain-fed, summer-sown) depends entirely on the southwest monsoon arriving and sustaining adequate rainfall from June through September. The sowing window is narrow — delays beyond 2–3 weeks compress the growing period and affect yield.

Major Kharif crops: paddy (rice), soybean, groundnut, cotton, maize, tur (arhar) dal, bajra, jowar, sugarcane.
Sowing typically begins: June (after monsoon onset in Kerala, ~June 1) and peaks in July.
A delayed monsoon onset or early withdrawal shortens the vegetative phase, reducing grain filling and yield.
India's rice output in a deficient monsoon year can fall 5–15% from normal, depending on the severity and geographic distribution of the deficit.
Oilseed crops (soybean, groundnut) are particularly sensitive to both delayed planting and mid-season dry spells.

Connection to this news: Reports of delayed paddy and oilseed sowing in central India are the ground-level agricultural symptom of the monsoon deficit — they set up the supply-side conditions that will drive food inflation in Q3 and Q4 of FY27.

Key Facts & Data

India's southwest monsoon season: June 1 (normal onset at Kerala) to September 30.
IMD's normal monsoon range: 96–104% of LPA (base period: 1971–2020).
Deficient rainfall threshold: below 90% of LPA.
El Niño identifier: SST anomaly ≥0.5°C above normal in Niño 3.4 region for 5 consecutive overlapping seasons.
Strongest El Niño events on record: 1997-98 and 2015-16 (SST anomaly >2.5°C).
WMO probability of El Niño continuing through Nov 2026: above 90%.
Of 16 El Niño events since 1950: 5 produced extreme Indian droughts.
Major El Niño drought years in India: 1972, 1982, 1987, 2002, 2009.
Positive IOD counteracts El Niño suppression; negative IOD amplifies it.
Key Kharif crops at risk from delayed sowing: rice, soybean, tur dal, groundnut.