Monday’s trade-driven rally lost momentum as the week progressed, with weak export sales and limited new Chinese buying weighing on wheat and corn, while wet US harvest conditions and strong cumulative soybean demand kept oilseeds comparatively supported.
Global grain markets finished the week of September 21–25 with sharply different performances across the three major crops. Wheat suffered the clearest deterioration as improved US Plains moisture, weak export commitments and growing discussion around Black Sea shipping reduced risk premium, while corn ended only marginally higher after giving back an early-week rally. Soybeans remained the strongest market, supported by Chinese demand, harvest delays and tight nearby meal supplies.
US-China Optimism Drove the Early Rally, but the Week Ended Without a Major Breakthrough
Trade expectations dominated the first half of the week. Monday’s grain rally was driven by hopes that the US-China meeting would lead to additional Chinese purchases of US corn and wheat on top of the existing soybean program, encouraging traders to add risk across agricultural futures. Corn surged 15 1/2 cents on Monday and soybeans gained 24 1/2 cents as markets positioned for a potentially stronger demand outlook.
That optimism faded quickly. By Thursday, the two sides had agreed to extend the trade truce by two months, but no new agricultural purchasing commitments had been announced. By Friday, the absence of clear signs that China would expand purchases beyond soybeans triggered speculative liquidation, particularly in corn and the soybean complex. Limited details from the meeting were expected to be released the following Monday, leaving markets without the immediate bullish catalyst traders had priced in earlier in the week.
Speculative Positioning Amplified Both the Rally and the Selloff
Heavy speculative positioning was a major source of volatility. Early in the week, managed money extended its corn long position to around 440,000 contracts, a new record according to the Tuesday outlook, while the combined soybean-complex long had already reached 541,150 contracts. These crowded positions helped accelerate Monday’s rally but also created vulnerability once trade optimism began to fade.
By the September 22 CFTC reporting date, managed money had reduced its corn net long by 12,405 contracts to 414,437 contracts, while soybean traders added 20,331 contracts to reach a net long of 265,041 contracts. Soymeal speculative length reached a new record of 192,368 contracts. Wheat positioning moved in the opposite direction, with Chicago spec funds increasing their net short to 13,144 contracts, while the KC wheat net long fell to 41,743 contracts.
Export Demand Clearly Favored Soybeans Over Wheat and Corn
By the end of the week, export data had become one of the clearest differentiators between crops. US wheat export commitments stood at 9.449 MMT, down 31% from last year and equal to 45% of the USDA export projection, versus an average sales pace of 54%. That weak demand profile added significant pressure to wheat.
Corn export commitments reached 18.238 MMT, down 29% year over year, representing 22% of the USDA projection and lagging the average sales pace of 29%. US Gulf FOB values also remained above Argentina and roughly $0.10–$0.20 above Brazil into early 2027, limiting US competitiveness and reinforcing the bearish demand signal.
Soybeans presented the opposite picture. Total commitments reached 21.2 MMT, up 94% from the same period last year, equal to 46% of the USDA forecast and ahead of the five-year average pace of 38%. Chinese purchases were estimated near 14 MMT, helping beans retain underlying demand support even after weekly export sales disappointed.
Wet Western Weather Slowed Harvest and Supported Soybeans and Meal
US weather became increasingly important as the week progressed. Corn harvest stood at 13% complete early in the week, ahead of the 11% average, while soybean harvest was 12% complete, compared with an 8% average. Heavy rain across parts of the western Corn Belt and Plains then began slowing fieldwork, while the central and eastern Midwest retained better harvest windows.
By Friday, forecasts called for 1 to more than 4 inches of rain from Texas toward the Great Lakes and from Nebraska toward Indiana. The resulting harvest delays tightened nearby soybean supplies in parts of the western Corn Belt and supported soymeal, with the October meal premium to December reaching nearly $5/ton. This physical tightness became an important counterweight to speculative selling in beans.
Plains Rain Turned Increasingly Bearish for Wheat
For wheat, the same weather pattern had the opposite impact. Winter wheat planting was only 17% complete early in the week, compared with a five-year average of 21%, but rainfall across the Plains improved soil moisture and reduced weather risk for establishment. By the end of the week, the seven-day forecast called for 2–4 inches of rain from the Texas Panhandle to Nebraska.
Drought coverage in spring wheat areas fell by 4 percentage points to 52%, while winter wheat drought coverage rose 1 point to 58%. The improving moisture outlook, together with weak exports and technical selling, became one of the strongest bearish forces in wheat by Friday.
Black Sea Risk Shifted From Escalation Toward Possible De-Escalation
Black Sea developments remained highly volatile. Early in the week, continued attacks on port infrastructure and cargo vessels supported wheat and reinforced concerns over Ukraine’s export capacity. Ukraine’s wheat shipments since July 1 were down 44% year over year, while the possibility of reduced winter planting in both Russia and Ukraine added longer-term production risk.
Later in the week, however, attention shifted toward possible de-escalation. Ukraine signaled readiness for a Black Sea truce based on proposals involving Egypt, India and Turkey, increasing pressure for safer shipping routes. At the same time, Ukraine discussed diverting as much as 20 MMT of grain through Baltic ports, at an estimated additional transport cost of $100/ton. One estimate suggested Black Sea logistics could remove as much as 38 MMT of grain supply from the global market in 2026/27, including 10 MMT of corn and 28 MMT of wheat.
Global Supply Signals Remained Mixed
International crop estimates offered contrasting signals. Coceral cut combined EU and UK wheat production to 137.5 MMT, down 3.3 MMT from its previous estimate and 7.5% below last year. Argentina’s 2026/27 wheat crop was projected at 23.4 MMT, down from 27.8 MMT last season. These figures were supportive for wheat but were unable to offset improving US weather and weak export demand.
Corn supply prospects were more mixed. Coceral projected EU and UK corn production at 48.6 MMT, down 14% year over year, while Argentina’s 2026/27 corn crop was estimated at 66 MMT, above the previous year’s 64 MMT. By Friday, Argentine planting had advanced to 17% complete, while France’s corn harvest reached 45%, far ahead of 13% last year and the five-year average of 11%.
South America Remained a Major Competitive Force in Soybeans
South American supply continued to cap the upside in soybeans. Brazil’s September soybean exports were expected near 8 MMT, below earlier forecasts of 8.3 MMT but still potentially a monthly record. Brazilian planting had moved above 1%, while Argentina’s 2026/27 soybean production was forecast at 53.6 MMT, above 50.1 MMT in 2025/26.
Sinograin also remained active in the domestic Chinese market, selling 338,674 MT of soybean reserves during the week and scheduling another 514,000 MT auction for the following Monday. These reserve releases limited the urgency for fresh imports even as Chinese purchases of US soybeans remained strong overall.
Energy and Currency Volatility Added to the Week’s Swings
Macro markets were volatile rather than consistently directional. WTI crude fell sharply early in the week, rebounded on Thursday, then dropped again on Friday, when Nov ’26 WTI fell $2.15/barrel to $92.45. Lower energy weighed particularly on soybean oil and reduced some of the broader commodity support.
The US dollar also changed direction several times. It reached a fresh two-month high during the middle of the week before falling sharply on Friday and erasing the previous session’s gain. While the weaker dollar offered some late-week support to US export competitiveness, it was not enough to offset crop-specific demand and weather pressures.
Wheat Futures
Wheat was the weakest major grain market of the week. Dec ’26 CBOT wheat closed Friday at $7.03 1/4/bu, down 3 3/4 cents on the day and down 11 cents for the week. Dec ’26 KC wheat lost 21 3/4 cents on the week, while Dec ’26 Minneapolis wheat dropped 27 3/4 cents. The market began the week supported by Black Sea attacks and trade optimism, but improved Plains moisture, weak US export commitments, increased Chicago speculative shorts and growing expectations for safer Black Sea shipping progressively took control.
Corn Futures
Corn finished almost unchanged despite one of the most volatile weeks in the complex. Dec ’26 corn closed Friday at $5.28 1/4/bu, up 3/4 cent on the session and up 3/4 cent for the week. The contract rallied sharply on Monday to $5.43 on US-China optimism, then fell through the week and briefly traded at $5.16, its lowest level in a month, before recovering Friday. Weak export commitments, poor US FOB competitiveness and disappointment over the lack of confirmed Chinese buying capped the market, while wet western harvest weather and Black Sea logistics provided support.
Soybean Futures
Soybeans outperformed the grain complex. Nov ’26 soybeans closed Friday at $13.19/bu, up 1 1/2 cents on the day and up 15 1/2 cents for the week. Beans surged to $13.28 on Monday, then gave back much of the rally as the US-China meeting failed to deliver a broader trade breakthrough, but strong cumulative export commitments, Chinese purchases near 14 MMT and harvest delays in the western Corn Belt kept the market supported. Oct ’26 soymeal gained $19.30 on the week, reflecting tight nearby supplies and strong physical demand, while heavy speculative length remained the main risk to further upside.