
A University of Illinois extension article reports corn at 63% maturity and 13% harvested, and soybeans only 10% harvested as of October 2. Cool recent weather and cloudy, rainy spells slowed field drying, though September rainfall was below normal.
Slow harvest progress delays grain marketing and can increase near-term harvest-time basis pressure. The delay is a modest supply-timing factor rather than a change in total crop size.
After 445 past neutral weather events, CORN moved a median +0.1% over 5 sessions (52% higher; middle half -1.4% to +1.6%), and +0.7% over 20.
After 324 past neutral weather events, SOY moved a median +0.0% over 5 sessions (52% higher; middle half -1.4% to +1.7%), and +0.7% 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.