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Successful Farming agronomists in several top corn states describe September 2026 in one word, with several calling it hot and others wet. As of September 27, 57% of the U.S. corn crop was rated good to excellent, 96% had dented and 18% was harvested.
Heat accelerated harvest in Arkansas and Illinois, while heavy rain in northwestern Illinois and Iowa delayed harvest and caused ear mold issues.
Mixed regional weather in September shows uneven crop stress and quality risks, with no single national shock. The impact on prices is limited, though quality issues could affect basis.
agriculture.comOct 3, 2026After 2,467 past weather events, Corn moved a median +0.1% over 5 sessions (51% higher; middle half -1.5% to +1.7%), and +0.6% over 20.
After 1,964 past weather events, Soybeans moved a median +0.1% over 5 sessions (51% higher; middle half -1.7% to +1.8%), and +0.3% 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.
