A sharper-than-expected decline in US corn conditions adds fresh supply concern, while soybeans remain caught between weakening crop ratings and heavy pressure from lower energy prices and biofuel-policy uncertainty.
The grain complex starts Tuesday, 25 August, mostly lower despite another deterioration in US crop conditions. Corn is holding close to Monday’s range after ratings fell more than expected, soybeans are pressured by weaker soybean oil and shrinking crush margins, while wheat is giving back part of Monday’s Black Sea-driven rally as spring wheat harvest advances faster than expected.
Corn Ratings Fall More Than Expected
The most important fresh fundamental signal is the deterioration in US corn conditions. Good-to-excellent ratings fell 3 percentage points to 57%, compared with expectations for only a 1-point decline, leaving overall ratings at a new low for the growing season and below the historical average. Updated crop ratings imply an average US yield of 180.1 bpa and production of 15.953 billion bushels, 30 million bushels below last week and 60 million below the current USDA forecast. The decline is supportive for corn, although it is far less severe than the much lower private production estimates that drove Monday’s rally.
Rapid Crop Development Brings Harvest Pressure Closer
The US corn crop is also moving steadily toward maturity, with 86% in the dough stage, 45% dented and 6% mature, all at or ahead of the five-year average. That limits some late-season production risk and brings the market closer to the point where physical harvest pressure begins to matter. After December corn closed higher in seven of the previous nine sessions and Monday’s high stood nearly $1/bu above the June low, producer selling ahead of harvest could increasingly cap rallies as farmers clear storage space.
European Corn Prospects Add Another Supportive Supply Signal
European production expectations remain another supportive element for corn. The EU crop-monitoring unit reduced its corn yield estimate by 5% to 6.61 MT/HA, adding to concerns about European supply following a difficult weather season. Meanwhile, Brazil’s 2025/26 second-crop harvest has reached 92%, still behind last year’s 98% pace, while first-crop planting for 2026/27 is only 2% complete. These developments keep some underlying support beneath corn even as US harvest pressure approaches.
Soybean Conditions Weaken, but the Supply Outlook Remains Comfortable
US soybean ratings slipped 1 point to 60% good to excellent, matching expectations but falling to the lowest level of the current crop cycle and just below the historical average. Updated ratings imply a yield of 52.8 bpa and production of 4.529 billion bushels, down 19 million bushels from last week but still slightly above the USDA forecast of 4.519 billion. That keeps the supply picture relatively balanced and prevents the deterioration in crop conditions from generating the same bullish response seen in corn.
Soybean Oil Remains the Main Drag on the Oilseed Complex
Soybean oil continues to lead the downside as energy prices weaken and uncertainty around US biofuel policy increases. WTI crude is down $2.80/barrel at $82.20, while gasoline and heating oil are also lower, reducing the energy-market support normally available to vegetable oils. At the same time, expectations that refinery exemptions could total as much as 1.8 billion, well above earlier estimates of 1.2–1.3 billion, have pushed D4 renewable fuel credits down to as low as $1.92, nearly $0.60 below their July peak. The combination remains distinctly bearish for soybean oil and continues to weigh on the broader soybean complex.
Falling Crush Margins Add Pressure to Soybeans
The weakness in soybean oil is also feeding directly into processing economics. Crush margins have fallen another $0.13 1/2/bu to $2.13 1/2/bu, the lowest level in six months. Lower margins reduce an important source of domestic soybean demand and make it harder for improving export competitiveness alone to support prices. US Gulf FOB offers remain $0.30–$0.35/bu below Brazilian offers, which is supportive for exports, but this advantage is currently being offset by weaker processing economics.
Wheat Gives Back Risk Premium as Harvest Accelerates
Wheat is under broader pressure after Monday’s sharp Black Sea-driven move. The US spring wheat harvest has reached 62%, well above expectations and the five-year average of 52%, while crop conditions slipped only 1 point to 51% good to excellent. Updated ratings imply spring wheat production of 453 million bushels, down 4 million from the previous estimate and well below the USDA forecast of 474 million, but the faster harvest pace is allowing more physical supply to reach the market and is limiting the impact of the lower production outlook.
Black Sea Risk Eases Slightly but Remains Unresolved
Geopolitical risk has not disappeared, but the immediate tone is less threatening than on Monday. Ukraine continues to pursue a diplomatic path regarding attacks in the Black Sea and maintains that maritime grain exports are not fully blocked. The possibility of discussions over safe passage reduces some of the risk premium that pushed wheat sharply higher at the start of the week, although the situation remains unresolved and could quickly return as a supportive factor if shipping conditions deteriorate again.
Wheat Futures
Wheat is starting Tuesday under pressure across the three major US classes. Sep ’26 Chicago wheat is down 10 cents at $6.71 3/4/bu, Sep ’26 KC wheat is down 15 cents at $7.35 1/2/bu, while spot Minneapolis wheat is down 8 1/2 cents at $6.85/bu. Faster-than-expected spring wheat harvest progress and a slightly less severe Black Sea risk tone are weighing on prices, while the lower implied spring wheat production estimate provides some underlying support.
Corn Futures
Corn is beginning Tuesday modestly lower after Monday’s sharp rally. Sep ’26 corn is down 1 cent at $4.90 1/2/bu, while Dec ’26 is also down 1 cent at $5.14 1/2/bu. The sharper-than-expected decline in crop ratings is supportive, but rapid crop development, the approach of harvest and the risk of increased producer selling are limiting further upside after the recent strong advance.
Soybean Futures
Soybeans are also starting lower, with Sep ’26 soybeans down 4 1/2 cents at $12.11 1/2/bu and Nov ’26 down 6 1/4 cents at $12.18/bu. Sep ’26 soybean meal is down $1.00 at $319.30, while Sep ’26 soybean oil is down 133 points at 65.80. Slightly weaker crop ratings provide some support, but lower energy prices, expectations for larger refinery exemptions and six-month-low crush margins are keeping the oilseed complex under pressure.