The monsoon and Indian agriculture: a working guide
The southwest monsoon is the single biggest variable in the Indian rural economy. Roughly half the country's farmland is rain-fed rather than irrigated, and even irrigated farms depend on monsoon-replenished reservoirs. A good monsoon underwrites a good rural season; a weak one ripples into food inflation, FMCG sales, two-wheeler demand, and political pressure. Here's what to know.
How the system works
India has two monsoon seasons:
- Southwest monsoon (June-September)The big one. Onset over Kerala in early June, advances northward to cover the country by mid-July, retreats from September onward. Delivers about 75% of annual rainfall.
- Northeast (retreating) monsoon (October-December)Smaller but critical for the southeast — Tamil Nadu, coastal Andhra Pradesh, parts of Karnataka. Delivers about 10-15% of annual rainfall, concentrated in those states.
What counts as 'normal'
IMD (India Meteorological Department) classifies the southwest monsoon by aggregate rainfall as a percentage of the Long Period Average (LPA, currently 87 cm):
- Above normal104-110% of LPA. Generally good news for kharif (summer-sown) crops, sometimes bad news for already-flooded regions.
- Normal96-104% of LPA. The baseline scenario.
- Below normal90-96% of LPA. Stress for rain-fed agriculture, especially if poorly distributed.
- Deficient<90% of LPA. Drought-like conditions; significant macroeconomic impact.
Why distribution matters more than aggregate
A 100% aggregate is meaningless if it falls in the wrong places at the wrong times. The four sub-regions IMD tracks (East+Northeast India, Central India, South Peninsula, Northwest India) can diverge sharply within a 'normal' year. Equally, week-to-week distribution matters — a 10-day dry spell in late June can damage transplanted rice irreversibly even if the season ends 'normal'.
Watch the weekly IMD bulletins and the cumulative deficit/surplus charts during June-September, not just the season-end aggregate.
Who tracks what
Four institutions matter most:
- IMD (India Meteorological Department)The official forecast. Issues a long-range forecast in April and updates through the season.
- SkymetPrivate forecaster. Often a useful independent signal alongside IMD.
- Ministry of AgricultureTracks sowing area weekly during kharif season — what's actually being planted is the on-the-ground confirmation of monsoon impact.
- RBIReads the monsoon into its inflation and growth outlook. Watch the bi-monthly policy minutes for monsoon-linked commentary.
What a weak monsoon means downstream
A genuinely weak monsoon typically causes the following ripple, in roughly this order:
- Crop damageRice, cotton, soybean, pulses, oilseeds — all kharif (summer-sown) crops at risk.
- Food inflationCereal and vegetable prices rise; CPI food sub-index spikes. RBI's policy room narrows.
- Rural demand softensLower farm incomes hit FMCG, two-wheeler, durable-goods sales in rural areas. Listen for it in company quarterly results from companies with rural-skewed distribution.
- Policy responsesGovernment may tighten/loosen export curbs (rice, wheat, sugar), pre-load welfare transfers, or release buffer stocks.
- Political pressurePersistent farm distress is politically combustible. Farmers' protests, MSP demands, debt-waiver requests rise.
El Niño, La Niña, IOD
Three climate phenomena consistently affect Indian monsoon outcomes:
- El NiñoPacific Ocean warming pattern. Statistically associated with weaker Indian monsoons, though not deterministic.
- La NiñaPacific cooling pattern. Statistically associated with stronger / above-normal monsoons.
- Indian Ocean Dipole (IOD)Sea-surface-temperature gradient across the Indian Ocean. A positive IOD tends to bolster the monsoon (sometimes overriding a weak El Niño).
Frequently asked
- When does the Indian monsoon start?
- The southwest monsoon typically arrives over Kerala in the first week of June and advances northward, reaching the rest of the country by mid-July. The retreating northeast monsoon starts in October and runs through December over the southeast.
- What is the Long Period Average rainfall?
- The Long Period Average (LPA) is the mean rainfall over a 50-year baseline period — currently 87 cm for the southwest monsoon. IMD's forecasts and reports are expressed as a percentage of LPA.
- Why does El Niño matter for the monsoon?
- Pacific Ocean warming associated with El Niño weakens the trade-wind pattern that drives the southwest monsoon, statistically correlating with below-normal Indian rainfall. The relationship is statistical not deterministic — strong monsoons have occurred during El Niño years.
- What's the difference between kharif and rabi crops?
- Kharif crops (rice, cotton, soybean, pulses, oilseeds) are sown at the start of the southwest monsoon and harvested in autumn. Rabi crops (wheat, barley, mustard, gram) are sown in winter and harvested in spring; they depend on residual soil moisture + irrigation rather than direct monsoon.
- How weak does the monsoon have to be to hurt the economy?
- IMD's 'below normal' classification (90-96% of LPA) usually doesn't move macro numbers much, especially if well-distributed. 'Deficient' (<90% of LPA) reliably hits rural demand, food inflation, and political pressure within months.
Related guides
- The Indian economy in 2026: a working primerHow India's economy is structured, who runs the major levers (RBI, finance ministry, NITI Aayog), and what to watch in 2026 — growth, inflation, the monsoon, and the rupee.
- A reader's guide to Indian politicsHow India's political system is structured — the parliamentary system, the major national parties, the regional powers, and the electoral cycle — written for someone trying to make sense of the news.