Corn futures broke above $5 per bushel to three-year highs on Wednesday, August 26, leading a broad grain rally that handed U.S. growers a potentially important marketing window ahead of harvest. December corn climbed 13 cents to $5.3650, while September contracts gained 13.5 cents to $5.14.

Soybeans and wheat posted even sharper gains. November soybeans jumped 28.25 cents to $12.66, and September Chicago SRW wheat surged 45 cents to $7.3050. Technical buying, stronger domestic and export demand, weather uncertainty and global supply risks drove the midweek acceleration, which intensified during the second half of the session.

What moved on August 26?

• September corn: $5.14/bu, up 13.5 cents
• December corn: $5.3650/bu, up 13 cents
• September soybeans: $12.5425/bu, up 26.25 cents
• November soybeans: $12.66/bu, up 28.25 cents
• September Chicago SRW wheat: $7.3050/bu, up 45 cents
• September Kansas City HRW wheat: $7.92/bu, up 37.5 cents

With prices at multiyear highs, the rally strengthens the hand of growers holding unpriced production — though it also raises the odds of profit-taking if traders lock in recent gains. For producers, the question has shifted from whether prices can recover to how much production should be marketed at current levels.

What supports the demand side?

The U.S. ethanol industry added a supportive pillar. Domestic production averaged 1.112 million barrels per day in the week ending August 21, according to U.S. Energy Information Administration data, while ethanol inventories rose 1% from the prior week.

China delivered the session's most closely watched demand signal. Private exporters reported to the USDA a sale of 12.2 million bushels of U.S. soybeans to China for delivery in the 2026/27 marketing year, which begins September 1. Chinese state stockpiler Sinograin also auctioned 8.2 million bushels of imported soybeans — roughly 77% of the volume offered — feeding speculation about room for additional U.S. purchases.

Traders are now positioning ahead of the USDA's next export sales report, covering the week ending August 20:

• Corn: expected sales of 31.5–63 million bushels, versus 41.3 million the prior week
• Soybeans: 40.4–113.9 million bushels expected
• Wheat: 7.3–20.2 million bushels expected
• Soybean meal: 200,000–500,000 metric tons
• Soybean oil: up to 12,000 metric tons

The soybean complex diverged within itself. September soybean meal rose more than 2.5%, while September soybean oil declined nearly 0.5% — a split that shows demand fundamentals hitting individual components of the oilseed complex differently.

How does weather shape the outlook?

Rain could reach parts of the Upper Midwest later this week, but NOAA projections indicate few areas will collect more than 0.5 inch between Thursday and Sunday. The agency's eight- to 14-day outlook for September 2–8 points to near-normal precipitation across much of the Corn Belt, with a strong probability of above-normal temperatures across the central United States.

Those conditions keep yield expectations in focus as crops reach the final stages of the growing season. Wheat carries its own supply risk premium: continued instability in the Black Sea region clouds grain flows from Russia and Ukraine, while earlier heat in Europe and persistent drought in parts of the U.S. Plains add support.

What should growers weigh before harvest?

Market specialists emphasize that producers should first establish a realistic view of field-level yield potential before determining how aggressively to sell into the rally. Historical patterns suggest storing corn solely in anticipation of substantially higher prices does not always produce better returns, making incremental sales worth evaluating when profitable levels emerge.

Storage expenses, basis, crop insurance, input costs and working-capital requirements all shape that decision, particularly with corn trading above $5 as harvest preparations begin.

South American acreage frames the longer-term picture. Brazilian consultancy Agroconsult estimates Brazilian farmers could plant 57.58 million acres of corn in 2026/27, up 3.1% year over year, while the Buenos Aires Grain Exchange projects Argentine corn area near 20.76 million acres, largely unchanged. A larger Brazilian crop could intensify export competition for U.S. agriculture in 2027.

For now, the market's focus rests on USDA export data, Chinese soybean demand and Corn Belt weather — and on whether corn can defend the $5 threshold after one of its strongest advances in recent years.