U.S. grain futures moved broadly higher Tuesday, Aug. 25, led by corn after USDA reported another deterioration in crop conditions, prompting traders to reassess production potential as harvest approaches. September corn gained 9 cents to $5.0050 per bushel and December added 8 cents to $5.2350, while soybeans and winter wheat also advanced. The move matters for U.S. producers because weaker crop ratings, uneven weather across major growing regions and renewed soybean export demand are adding uncertainty to commodity prices and yield expectations at a critical point in the marketing calendar.

The main catalyst for corn came from USDA's latest Crop Progress figures. Only 57% of the U.S. crop was rated good to excellent as of Aug. 23, down three percentage points from the previous week and below market expectations of 59% to 60%. Another 26% was rated fair, while 17% was classified as poor or very poor. The deterioration encouraged additional technical buying and renewed questions over final production following drought pressure in western areas and severe flooding farther east. With harvest nearing, the market is becoming increasingly sensitive to any evidence that national yields could fall short of earlier expectations.

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U.S. Corn Conditions and Development - Aug. 23

Source: USDA Crop Progress data.

Crop development, however, remains relatively advanced. USDA reported that 86% of corn had reached the dough stage, up from 76% a week earlier and ahead of the five-year average of 82%. The share of the crop that had dented reached 45%, compared with 29% the previous week and a five-year average of 41%, while 6% was mature, matching the historical pace. The combination of faster crop development and declining condition ratings leaves traders with a more complicated yield outlook, particularly after weather extremes affected different sections of the Corn Belt during the growing season.

Weather remains another important variable. NOAA forecasts cited in the market assessment indicated that late-summer storms could deliver another 1 to 2 inches of rain across parts of the Midsouth between Wednesday and Saturday, while much of the Corn Belt was expected to receive little or no additional precipitation during that period. The eight-to-14-day outlook pointed to seasonally wetter conditions for the Plains and western Corn Belt from Sept. 1 through Sept. 7, along with above-normal temperatures across portions of the Midwest and Plains as September begins.

Soybean Demand Adds Support as Wheat Follows the Grain Market Higher

Soybeans posted stronger gains as demand-driven technical buying carried prices higher through much of Tuesday's session. September futures rose 12 cents to $12.28 per bushel, while November gained 13.5 cents to $12.3775. Adding fundamental support, private exporters reported to USDA the sale of 4.9 million bushels of soybeans to unknown destinations for delivery during the 2026-27 marketing year, which begins Sept. 1. The transaction put export demand back into focus as U.S. growers approach harvest and the market begins shifting its attention toward new-crop supplies.

Tuesday Grain Futures Market Snapshot

Source: U.S. grain futures market data from the Aug. 25 market session.

Soybean crop conditions also weakened, although less sharply than corn. USDA rated 60% of the crop good to excellent, down one percentage point from the previous week, while traders had generally expected conditions to remain unchanged. Another 28% was rated fair and 12% poor or very poor. Crop development remained ahead of normal, with 91% setting pods, up from 85% a week earlier and above the five-year average of 88%. Six percent was dropping leaves, putting this year's pace two percentage points ahead of the five-year average.

U.S. Soybean Conditions and Development

Source: USDA crop progress and export sales data.

Wheat followed the broader move higher, although gains remained modest. September Chicago SRW wheat added 3.75 cents to $6.8550 per bushel, while September Kansas City HRW gained 4 cents to $7.5450. Technical buying and spillover strength from other commodities supported the market despite weakness in energy prices. Spring wheat conditions slipped another point, with 51% of the crop rated good to excellent, 35% fair and 14% poor or very poor. Harvest reached 62% completion through Sunday, while USDA has marked the 2025-26 winter wheat harvest as virtually complete.

With harvest approaching, the grain market is running out of room to trade solely on projections. The three-point drop in corn conditions provided support to futures Tuesday, but the first commercial yield reports will begin to determine the actual size of the U.S. crop. Those early results from the Corn Belt will be closely watched for evidence that either confirms or challenges current production expectations. Until then, crop conditions and demand will remain key drivers for price direction in Chicago, with soybean export business providing an additional signal as the 2026-27 marketing year gets underway.