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CBOT grain and soybean futures fell sharply on August 4 as oil prices dropped on hopes of a diplomatic resolution to the Iran war that could ease Strait of Hormuz flows. Wheat also tracked Black Sea export risks, while corn and soybeans followed US crop conditions after a hot, dry spell.
Forecasts called for August Midwest rain.
Lower crude oil reduces biofuel-linked demand support for grains and soyoil, and the rain forecast removes weather risk premium, both pushing grain futures lower.
livemint.comReutersAug 4, 2026After 87 past bearish geopolitics events, Corn moved a median +0.1% over 5 sessions (51% higher; middle half -1.5% to +2.1%), and +0.3% over 20.
After 53 past bearish geopolitics events, Soybeans moved a median -0.3% over 5 sessions (47% higher; middle half -1.9% to +1.2%), and +1.0% over 20.
After 80 past bearish geopolitics events, Wheat (SRW) moved a median -0.4% over 5 sessions (44% higher; middle half -1.4% to +1.9%), and -0.5% over 20.
After 255 past bearish geopolitics events, Crude Oil (WTI) moved a median -2.4% over 5 sessions (31% higher; middle half -7.0% to +1.7%), and -5.0% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
