U.S. grain markets ended Friday, Aug. 28, with corn, soybeans and winter wheat firmly higher, as traders combined forecasts for hotter weather across the central United States with stronger soybean demand and renewed geopolitical risk in the Black Sea. The move matters directly to U.S. producers because it arrives just weeks before harvest pressure typically increases available supplies and weighs on commodity prices, cash bids and farm revenue expectations. December corn climbed to $5.3650 per bushel, November soybeans reached $12.88 and September Chicago SRW wheat settled at $7.67.

Weather emerged as one of the market's immediate catalysts. According to National Oceanic and Atmospheric Administration forecasts cited in the market report, areas north of Interstate 80 were expected to receive measurable precipitation as August ended, while locations farther south could remain dry. More importantly for traders assessing late-season crop risk, NOAA's eight-to-14-day outlook pointed toward warmer-than-normal temperatures across the entire central United States from Sept. 4 through Sept. 10, accompanied by potentially drier conditions in portions of the Southern Plains and western Corn Belt.

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Corn futures maintained their overnight advance through Friday as another round of technical buying supported the market. September corn added 1.75 cents to $5.12 per bushel, while the economically important December contract gained 3 cents and finished at $5.3650. The rally offers producers a stronger pricing environment ahead of harvest, although increasing physical supplies could soon test that momentum. For farm businesses already managing elevated input costs, crop insurance decisions and tight operating margins, even relatively modest movements in futures can materially alter marketing opportunities and projected revenue per acre.

USDA data added a more nuanced picture for corn. Combined old- and new-crop sales totaled 42.2 million bushels in the week ending Aug. 20, toward the lower end of analysts' expected range of 31.5 million to 63 million bushels. Export shipments reached a stronger 77.6 million bushels, but remained 19% below their prior four-week average. That leaves the market balancing weather premiums and technical strength against demand indicators and the approaching harvest. The September WASDE will therefore become another important test for yields, production expectations, ending stocks and the durability of the current bullish environment.

Table based on the futures quotations accompanying the corn, soybean and wheat market charts and commentary in the Aug. 28 report.

Soybean demand and Black Sea risk add fuel to the grain rally

Soybeans delivered one of Friday's strongest performances after a wave of export sales triggered additional technical buying. September futures advanced 19.75 cents to $12.7625 per bushel and November gained 20 cents to $12.88. The broader soy complex also strengthened, with September soymeal up nearly 2.5% and soybean oil jumping 3.75%. For U.S. growers, the significance extends beyond the futures screen: improving export demand as the 2026/27 marketing year begins could provide an important counterweight to seasonal harvest pressure and potentially strengthen basis opportunities across parts of the supply chain.

The demand figures provided the fundamental support. Private exporters reported 6.7 million bushels of soybeans sold to China and another 8.3 million bushels to undisclosed destinations for delivery during the 2026/27 marketing year beginning Sept. 1. Exporters also reported 100,000 metric tons of soybean meal sold to Germany and another 100,000 metric tons to the Netherlands. USDA separately reported combined old- and new-crop soybean sales of 93.8 million bushels for the week ending Aug. 20, near the upper end of analysts' expectations, while export shipments increased 12% week over week to 16.6 million bushels.

USDA figures reported for sales and shipments in the Aug. 28 market recap.

Wheat added a different source of risk premium. September Chicago SRW and Kansas City HRW futures each jumped 24.25 cents, settling at $7.67 and $8.2775 per bushel, respectively, as concerns about escalating fighting in the Black Sea encouraged technical buying. Russia and Ukraine together account for at least 25% of global wheat exports, according to the report, meaning disruptions to regional shipments could redirect international buyers toward alternative origins. For U.S. wheat producers, that creates potential export opportunities at a moment when global supply uncertainty is again becoming an important component of price discovery.

South Africa could provide another opening for U.S. wheat. The country's planted wheat area has fallen to nearly a 100-year low, contributing to import requirements of roughly 2 million metric tons during the current marketing year. The United States currently represents only about 3% of those purchases, but USDA's Foreign Agricultural Service said U.S. exporters have substantial room to increase market share following South Africa's reduction in wheat import duties. That potential demand comes as analysts cited in the report describe wheat's rise to three-year highs as the product of both technical strength and tighter supply fundamentals.

For U.S. farmers, the central question is whether the rally can survive the transition into harvest. Hotter weather, soybean export sales and Black Sea uncertainty are currently supporting prices, but larger physical supplies can quickly shift negotiating power back toward grain buyers. Producers, elevators and co-ops will consequently be watching weather models, basis levels, USDA export reports and the September WASDE closely. The quotations used here come directly from the CBOT futures market data reproduced in the Aug. 28 market recap, alongside USDA and NOAA figures cited in that report.