A single-session gain of 1.44% to 78.88 cents/lb in ICE December cotton hardly offsets a 4.6% weekly slump. The market is trading a contradiction: heavy rain across US cotton belts during the boll-opening stage does threaten crop quality, yet a stronger dollar, weaker oil prices and soft demand are simultaneously capping any weather premium. For China's textile supply chain, the real issue is not the daily futures swing but how changes in US cotton quality grades will transmit into imported yarn and grey fabric costs.
Weather Versus Exports
US cotton regions are in a critical boll-opening window. Industry data indicates that persistent heavy rain and severe thunderstorms damage exposed cotton fibers, lower crop grades, and strong winds can cause yield losses. A risk management advisor noted the market was broadly weak this week, with the weather theme merely a brief disruption within a downtrend. This suggests the market is not treating rainfall as a trend-changing bullish factor, but rather a short-term sentiment repair.
Export data further confirms demand-side fatigue. USDA reported that for the week ending September 24, current-crop US upland cotton net sales reached 202,567 bales, down 12% week-on-week but up 101% from the four-week average, with 38,370 bales sold to China. Shipments totaled 149,507 bales, down 9% week-on-week and 11% from the four-week average, with only 1,323 bales shipped to China. Next-crop net sales were 39,160 bales, with zero sold to China. This reveals a signal: Chinese buyers have extremely low willingness to purchase forward US cotton. Although nearby purchases recovered somewhat on restocking demand, slower shipments indicate port arrival pressure is being pushed back.
Oil Prices and Fiber Substitution
The G7 agreed to release 100 million barrels of diesel and crude from emergency reserves and pledged to avoid energy export restrictions. International oil prices fell, with European diesel futures dropping over 4%. The logic suppressing cotton prices is that lower oil prices reduce production costs for petroleum-based synthetic fibers, especially polyester. As polyester is the primary substitute for cotton in yarn blending, its price decline erodes cotton's comparative advantage and dampens mills' willingness to purchase natural fiber.
The Cotlook A Index stood at 88.35 cents/lb on October 2, down 80 points, echoing ICE cotton's weakness. The overall international cotton price center is shifting lower, pressuring domestic Zhengzhou cotton and spot markets. For import yarn mills using US and Brazilian cotton as primary raw materials, raw material cost expectations are weakening, but whether order flows will follow remains uncertain.
Industrial Transmission and Procurement Rhythm
From a supply chain perspective, the impact of rain during the US boll-opening period will not immediately appear in spot quotes. It first affects quality premiums and grading structure. If rain persists and reduces the share of high-grade cotton, the proportion of lower-grade resources in future US exports will rise. This is bad news for combed yarn and high-count grey fabric mills requiring high-strength, low-impurity raw materials. Meanwhile, zero Chinese net sales for next-crop US cotton indicate domestic buyers are waiting for new-crop price signals.
For mills in Southeast Asia and South Asia, slower US cotton shipments may push them toward Brazilian and Australian cotton inquiries, redistributing global cotton trade flows. Domestically, Xinjiang cotton picking progress and seed cotton purchase prices will become the core variables for Zhengzhou cotton pricing, while the marginal impact of foreign weather themes will gradually diminish.