IMD records 2026 southwest monsoon rainfall at 87% of long-period average, fourth-lowest since 2001 The deficient monsoon has major implications for rain-fed agriculture, water security, food prices and disaster-management planning. Environment · 1 Oct 2026 · GS: GS1, GS3, Essay · Exam yield: High WHY THIS MATTERS The 2026 southwest monsoon supplied only 87% of India’s long-period average, making it the fourth-lowest season since 2001. The deficit directly affects rain-fed farming, reservoir recharge, drinking-water security, food prices and preparedness for drought-like conditions, even though some regions received normal or excess rainfall. IN PLAIN WORDS The southwest monsoon is India’s main seasonal rain system, arriving broadly from June to September and supplying most annual rainfall across large parts of the country. In 2026, India received 759.4 mm against a long-period average of 868.6 mm—87% of normal. IMD classified the season as deficient because all-India rainfall was below 90% of its long-period average. It was the fourth-lowest since 2001 and the thirteenth-lowest since 1901. (mausam.imd.gov.in) The headline number hides sharp regional differences. Northwest India received 94% and Central India 97%, but East and Northeast India received only 74%, while the South Peninsula received 76%. The monsoon core zone, containing much of India’s rain-fed agricultural belt, received 779.9 mm, below the normal range of 782.8–881.2 mm. June was especially weak at 65% of normal; July recovered to 101%, but August and September again remained below normal. (mausam.imd.gov.in) Think of the monsoon as a four-month national water budget: a good July cannot fully compensate for a dry June if sowing, groundwater recharge and reservoir inflows were missed at the right time. Therefore, the issue is not merely the total quantity of rain, but its timing, location and intensity. A deficient season can coexist with floods because short, intense spells may produce runoff without adequately replenishing soil moisture or aquifers. KEY FACTS • India received 759.4 mm rainfall during June–September 2026, equal to 87% of the long-period average. • The season was the fourth-lowest in terms of all-India rainfall since 2001 and the 13th-lowest since 1901. • East and Northeast India received 74% of its regional LPA, while South Peninsula received 76%. • The monsoon core zone, covering much of India’s rain-fed agricultural belt, received 779.9 mm against the normal range of 782.8–881.2 mm. • Seventeen of 36 meteorological subdivisions, covering 42% of India’s area, recorded deficient rainfall. HOW WE GOT HERE India’s agricultural calendar, reservoir operations and rural economy have historically been organised around the June–September southwest monsoon. IMD compares each season with the long-period average, a climatological benchmark calculated from a long rainfall record, rather than with the previous year alone. This allows the country to identify whether rainfall is broadly deficient, normal or excess. (mausam.imd.gov.in) The 2026 season began unevenly. The monsoon reached Kerala on 4 June, three days after the climatological normal date of 1 June, and covered the entire country by 9 July, close to the normal date of 8 July. June rainfall was only 65% of normal, while July temporarily improved to 101%; August fell to 84% and September to 92%. (mausam.imd.gov.in) IMD’s first-stage forecast issued on 15 April 2026 projected 92% of the long-period average, while its end-May update projected 90%; the actual outcome was 87%. Thus, the broad warning of below-normal rainfall was correct, although the Kerala onset forecast was substantially early compared with the actual onset. (mausam.imd.gov.in) THE BIGGER PICTURE Environmental — Water balance and ecological stress A seasonal rainfall deficit reduces soil moisture, groundwater recharge and inflows into reservoirs, but the ecological effect depends on where and when rain falls. The monsoon core zone received 779.9 mm, below its normal range of 782.8–881.2 mm, threatening water availability in rain-fed landscapes. Uneven rainfall can also produce both dry spells and flash floods: intense rain may run off rapidly instead of infiltrating into soil. This complicates watershed management, river-basin planning and ecosystem recovery, especially in drought-prone and groundwater-dependent regions. (mausam.imd.gov.in) → Monsoon risk is determined by rainfall timing, location and intensity—not merely the national seasonal total. Economic — Agriculture, prices and rural demand The first economic channel is agriculture. A weak June can delay sowing and reduce germination, while deficient later rainfall can affect crop growth, especially where irrigation is limited. The 2026 deficit in the monsoon core zone is significant because that zone covers much of India’s rain-fed agricultural belt. Lower output can raise food prices, increase the need for procurement or imports, and weaken rural incomes and consumption. However, Central and Northwest India received near-normal rainfall, so the economic impact will vary across crops, states and irrigation systems. (mausam.imd.gov.in) → A national rainfall deficit becomes an economic shock only through its transmission to crops, incomes, prices and water-dependent production. Social — Water security and regional inequality Rainfall deficiency is socially unequal. Seventeen of 36 meteorological subdivisions, covering 42% of India’s area, recorded deficient rainfall; East and Northeast India received 74% of regional normal and the South Peninsula 76%. Communities dependent on rain-fed farming, shallow wells, livestock and local tanks face greater livelihood stress than canal- or reservoir-served regions. Reduced water availability can also increase unpaid work for women, seasonal migration and competition between domestic, agricultural and industrial users. The same monsoon therefore produces different welfare outcomes across regions and social groups. (mausam.imd.gov.in) → Rainfall deficits amplify pre-existing inequalities in irrigation access, income, groundwater dependence and coping capacity. Science & Tech — Forecasting, variability and preparedness The season illustrates why monsoon forecasting must move beyond one national percentage. IMD correctly anticipated below-normal seasonal rainfall: forecasts of 92% and 90% compared with an actual 87%. Yet the onset over Kerala was forecast for 26 May and occurred on 4 June. The season also recorded 14 low-pressure systems, including six monsoon depressions, and 77 low-pressure-system days against a normal 57. Forecast systems must therefore communicate uncertainty, regional variation, dry spells and extreme-rainfall risk together. (mausam.imd.gov.in) → Useful forecasting means actionable regional and time-specific information, not just a single seasonal average. Historical — Trend interpretation and policy memory Calling 2026 the fourth-lowest monsoon since 2001 signals an unusual recent event, while its thirteenth-lowest position since 1901 places it in a much longer historical record. These rankings should not be treated as proof that one season alone establishes a climate trend. They are best used to trigger comparison of rainfall variability, dry-spell frequency, extreme rainfall and water-system resilience over multiple decades. Policy should therefore combine seasonal contingency planning with long-term adaptation rather than rely on a single-year emergency response. (mausam.imd.gov.in) → Historical ranking identifies severity; it does not by itself establish causation or a permanent climate shift. THE BIG DEBATE Should a deficient all-India monsoon automatically be treated as a national drought-like emergency? For: • The 87% national rainfall total and 42% area under deficient subdivisions indicate serious risks to agriculture, water recharge and rural incomes. • The monsoon core zone fell below its normal range, making the deficit especially relevant for rain-fed farming and food-security planning. • Early national intervention can reduce distress through crop advisories, drinking-water measures, fodder support and market stabilisation. Against: • Rainfall was near normal in Central and Northwest India, so a national emergency label may ignore substantial regional resilience. • Seasonal totals conceal short intense spells, reservoir storage, irrigation coverage and crop-specific conditions; rainfall alone cannot establish drought. • Broad emergency responses can misallocate scarce funds when state-level monitoring would better target affected districts. The balanced take: The correct approach is neither complacency nor automatic national alarm. The 2026 data justify a heightened, regionally differentiated response because the core agricultural belt was below normal and several regions were severely deficient. Emergency classification should additionally use soil moisture, reservoir storage, crop condition, groundwater and drinking-water indicators. ANSWER IT IN MAINS Discuss how deficient and uneven monsoon rainfall can affect India’s agriculture, food security and rural economy. (GS3) How to attack it: Begin with the 87% seasonal rainfall figure and the core-zone deficit. Analyse crop timing, irrigation inequality, groundwater, prices, rural demand and state capacity. Conclude with district-level contingency planning and climate-resilient agriculture. Quote this: IMD’s 2026 finding that the monsoon core zone received 779.9 mm, below its normal range of 782.8–881.2 mm. Rainfall variability, rather than seasonal rainfall alone, is the central challenge of Indian water management. Examine. (GS3) How to attack it: Define variability through timing, geography and intensity. Use the 2026 contrast between deficient June, normal July and weak August–September, then discuss storage, recharge, floods, droughts and basin planning before proposing integrated water management. Quote this: IMD 2026 monthly data: June 65%, July 101%, August 84% and September 92% of long-period average rainfall. How can weather forecasting contribute to disaster-risk reduction and better agricultural decision-making in India? (GS3) How to attack it: Open with the distinction between seasonal prediction and actionable local warning. Assess 2026 forecast performance, onset uncertainty, regional variation and low-pressure systems; conclude with impact-based, district-level advisories linked to crop and water decisions. Quote this: IMD 2026 verification: seasonal forecasts of 92% and 90% anticipated below-normal rainfall, while actual rainfall was 87%. A deficient monsoon is not automatically a uniform national crisis. Discuss with reference to regional diversity. (Essay) How to attack it: Use the national figure as the hook, then contrast Central and Northwest India with East, Northeast and South Peninsula. Examine federal coordination, inequality and resilience, and conclude that evidence-based regional targeting is superior to one-size-fits-all responses. Quote this: IMD 2026 regional departures: Central India 97%, Northwest India 94%, East and Northeast India 74%, and South Peninsula 76% of normal. PRELIMS QUICK-FIRE • [Data] India received 759.4 mm rainfall in June–September 2026, equal to 87% of its long-period average, according to IMD 2026. — 87% is deficient under IMD’s seasonal classification because it is below 90% of the long-period average. • [Data] The 2026 southwest monsoon was the fourth-lowest since 2001 and thirteenth-lowest since 1901 in all-India rainfall. — The two rankings use different comparison periods; do not treat them as identical records. • [Geography] East and Northeast India received 74% of regional normal rainfall, while the South Peninsula received 76% during 2026. — Central India received 97% and Northwest India 94%, showing strong regional variation. • [Geography] The monsoon core zone received 779.9 mm in 2026, below its normal range of 782.8–881.2 mm. — The core zone broadly overlaps India’s major rain-fed agricultural belt; it is not the entire country. • [Data] Seventeen of India’s 36 meteorological subdivisions, covering 42% of area, recorded deficient rainfall in 2026. — Eighteen subdivisions were normal and Odisha alone was excess, according to IMD. • [Data] India’s 2026 monthly rainfall was 65% of normal in June, 101% in July, 84% in August and 92% in September. — A normal July could not fully offset the weak June and below-normal August–September rainfall. • [Term] The southwest monsoon reached Kerala on 4 June 2026 and covered the country by 9 July 2026. — Monsoon onset over Kerala and complete national coverage are different milestones. • [Data] The 2026 season recorded 14 low-pressure systems, including six monsoon depressions, and 77 low-pressure-system days. — A higher number of systems does not necessarily mean higher seasonal rainfall because tracks and persistence matter. WHAT SHOULD HAPPEN 1. Adopt district-level monsoon contingency plans before the season, with crop, fodder, drinking-water and livestock actions triggered by rainfall and soil-moisture thresholds. District-level planning can respond to the strong spatial variation hidden by the all-India figure and reduce delays in relief and crop protection. (National Disaster Management Authority guidelines on management of drought) 2. Accelerate watershed development, farm ponds, aquifer recharge and restoration of tanks, while regulating excessive groundwater extraction. Improving infiltration and local storage converts short rainfall spells into usable water and reduces dependence on a single monsoon window. (National Water Policy, 2012) 3. Promote millets, pulses, short-duration varieties, micro-irrigation and climate-resilient farming in vulnerable rain-fed areas. Diversified and water-efficient agriculture lowers crop failure risk when rainfall is delayed, interrupted or below normal. (National Mission for Sustainable Agriculture) 4. Strengthen impact-based forecasting that combines rainfall forecasts with reservoir storage, soil moisture, crop stage and health-risk information. Public agencies need forecasts translated into decisions, such as when to sow, release water, protect crops or prepare for floods. (Sendai Framework for Disaster Risk Reduction 2015–2030) 5. Use transparent food-stock, procurement and price-monitoring systems while protecting small farmers and vulnerable consumers. A deficient monsoon can affect both farm incomes and food prices, requiring simultaneous producer support and consumer protection. (Sustainable Development Goal 2) JARGON, DEMYSTIFIED • India Meteorological Department (IMD) — India’s national weather agency, responsible for weather observation, forecasting, climate data and official monsoon assessment. (IMD figures are the primary official source for Indian monsoon rainfall statistics.) • Long-period average (LPA) — The benchmark average rainfall calculated from a long historical period, used to judge whether current rainfall is deficient, normal or excess. (For all-India southwest monsoon rainfall in 2026, the LPA was 868.6 mm.) • Southwest monsoon — The seasonal wind-and-rain system that brings most of India’s annual rainfall mainly between June and September. (Its onset, advance, active spells, breaks and withdrawal are separate features.) • Monsoon core zone — A broad region containing much of India’s rain-fed agricultural belt, used to assess rainfall relevant to crop production. (The 2026 core-zone rainfall was below its normal range.) • Meteorological subdivision — An IMD rainfall-reporting region used to classify seasonal rainfall across parts of one or more states. (India has 36 such subdivisions in the cited 2026 assessment.) • Low-pressure system — An area where air pressure is relatively low, often associated with clouds and rainfall; stronger systems can become depressions. (The 2026 monsoon had 14 such systems and 77 system-days.) • Rain-fed agriculture — Farming that depends mainly on rainfall rather than assured canal, groundwater or other irrigation. (It is especially sensitive to delayed onset, dry spells and uneven rainfall.) REVISE IN 30 SECONDS • 2026 all-India monsoon rainfall: 759.4 mm, or 87% of long-period average. • It was fourth-lowest since 2001 and thirteenth-lowest since 1901. • East and Northeast India received 74%; South Peninsula received 76%. • The monsoon core zone received 779.9 mm, below its normal range. • June was severely weak at 65%; July recovered, but August and September were below normal. • Deficient rainfall requires regional, crop-specific and water-system-based responses. STUDY NEXT Static links: Indian monsoon mechanism and variability, Agriculture and rain-fed farming, Water resources and groundwater management, Disaster management and climate resilience Essay angle: A monsoon is not merely rain from the sky; it is India’s annual test of ecological resilience, economic planning and social equity. Interview probe: If national rainfall was 87% but some regions were normal, should policy respond nationally or regionally? Explain the indicators you would use. SOURCES • Salient Features of the 2026 Southwest Monsoon Season — IMD — https://mausam.imd.gov.in/Forecast/marquee_data/Salient_Features_SW_MONSOON%20_2026_30_sep.pdf • Rainfall Statistics — India Meteorological Department — https://mausam.imd.gov.in/responsive/rainfall_statistics.php Source: IMD records 2026 southwest monsoon rainfall at 87% of long-period average, fourth-lowest since 2001 — https://mindsofaspirants.com/current-affairs/kx746n467f8nftmky71h1ar8618ffp3y
