コーヒーと砂糖の先物急騰、その背景は？エルニーニョ、在庫減少、インドの輸出禁止が重なる

Soft commodity markets are flashing red. Arabica coffee futures have surged on a combination of adverse weather in Brazil, critically low exchange inventories, and speculative short-covering, while sugar prices have spiked after India abruptly banned exports. The common thread tying these moves together is a global supply system that has lost its usual shock absorbers.

Here is a breakdown of the forces driving each market and how they reinforce one another.

☕ Arabica Coffee: Weather Delays, Empty Warehouses, and Short-Covering

Arabica futures have rallied on several converging supply-side fears:

El Niño weather risk for the next crop. The US National Oceanic and Atmospheric Administration (NOAA) estimates an 82% probability that El Niño conditions will emerge between May and July and persist through the end of the year, with a 67% chance of a "Super El Niño" . An El Niño pattern could delay rains in Brazil during the critical September–October flowering period, potentially hurting the 2026/27 coffee crop . This concern has sparked short-covering among speculators who had built net short positions .

Brazil harvest disruptions and quality concerns. Persistent rains in key Brazilian growing regions have delayed the 2025/26 harvest and raised concerns about bean quality. As of June 17, Brazil’s harvest progress was estimated at 39% of planted area, trailing the 43% pace recorded at the same time last year and slightly below the five-year average of 40% . The rain has also soaked harvested coffee that was drying at farmyards in main producing areas .

ICE certified stocks at multi-year lows. ICE-certified arabica warehouse stocks have fallen to approximately 396,000 bags, the lowest level in recent years and less than half of the 859,389 bags held a year earlier . The ICO confirmed the drawdown, reporting that ICE-certified arabica stocks fell 13.5% to 0.48 million bags in May 2026, a multi-month low . These ultra-low stocks leave the market with essentially no buffer against any fresh supply shock.

Cold-front risk. A potential cold front sweeping through Brazil’s southern states revived frost-risk concerns, adding another layer of supply uncertainty and supporting futures .

Taken together, the coffee rally is a textbook demonstration of how inventory depletion magnifies the price impact of even modest weather and harvest disruptions.

🍬 Sugar: India’s Export Ban, El Niño, and the Ethanol Pivot

Sugar prices have climbed on a different but equally potent set of catalysts:

India’s abrupt export ban. On May 13, 2026, India imposed an immediate ban on exports of raw, white, and refined sugar, effective until September 30 or until further notice . The Directorate General of Foreign Trade shifted sugar exports from a "restricted" to a "prohibited" category . This marked a sharp reversal: just one week earlier, government sources had said India did not intend to limit sugar exports despite a production decline, because weaker demand had helped offset the loss .

India is the world’s second-largest sugar producer after Brazil, and the ban removes a key source of global supply . Exceptions were made only for limited quotas to the EU and US and for shipments already loading before May 13 .

Domestic production and El Niño fears. The ban was driven by concerns over lower domestic production, weak cane yields in key states like Uttar Pradesh and Maharashtra, and a deficit monsoon forecast . The possible emergence of El Niño was explicitly cited as a factor that could affect India’s future agricultural production . India’s cumulative monsoon rainfall tracked 42% below normal in June 2026, the weakest in 11 years .

Shifting ethanol economics in Brazil. While the original analysis noted the provided sources did not support specific claims about Brazil's ethanol blending rate, those sources in fact document the linkage. Brazil’s government confirmed an increase in the mandatory ethanol blend in gasoline to 32% from 30% . The country's Centre-South mills allocated 58.38% of cane to ethanol in the early 2026/27 season, up from 49.9% the prior year, reducing the share available for sugar production . Green Pool raised its 2026/27 global sugar deficit forecast to 4.3 million metric tons from 1.66 million, citing elevated oil prices encouraging mills to divert cane toward ethanol . StoneX projected a global sugar deficit of 550,000 tons in 2026/27, a sharp swing from the prior season's surplus .

El Niño threat to Asian producers. The emergence of an El Niño is likely to curb rainfall not just in Brazil and India but also in Thailand, the world's third-largest sugar-producing region, adding to supply concerns across the board .

🔗 How the Factors Compound

The two markets are not isolated. They amplify each other through common structural vulnerabilities:

• Low inventories amplify every shock. With ICE coffee inventories down to roughly 396,000 bags—a 2.25-year low—the coffee market has virtually no cushion against the next disruption . The same logic applies to sugar, where global stocks have been drawn down by three years of cumulative production deficits .

• Brazil is the common pivot. Brazil’s coffee-growing regions are central to arabica weather worries, and Brazil is also the world’s largest sugar exporter. When Brazil’s cane goes to ethanol instead of sugar, it tightens global sugar supply at the same time that coffee markets are already on edge .

• India’s export ban removes a key safety valve. As the second-largest sugar producer, India’s exit from export markets removes an important source of global supply just as weather and domestic production risks are rising . The ban could push international buyers to compete more intensely for Brazilian and Thai sugar.

• Speculative dynamics accelerate the moves. In arabica coffee, the combination of harvest worries, El Niño risk, declining certified stocks, and short-covering has driven unusually sharp rallies . In sugar, speculators expanded their net short position back toward record levels before prices reversed higher , suggesting the market has not yet fully priced in the tightening.

The Bottom Line

The surge in arabica coffee and sugar futures is not the result of any single factor. It is the product of a fragile global supply system where El Niño weather risk, depleted inventories, policy reversals, and shifting energy markets are all pulling in the same direction. The market has lost its usual buffers, which means even modest disruptions can produce outsized price moves.

For traders and commodity analysts, the key variable to watch is whether Brazil’s next coffee and sugar harvests materialize as expected, and whether India extends its export ban beyond September 30. If either of those safety valves fails, the current supply fears could become a full-blown structural deficit.