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CBOT December corn settled up 1/4 cent at $3.56-1/2 per bushel after dipping to $3.55-1/4, its lowest since mid-July.
Nearby corn futures, including the benchmark December contract, are hovering less than 10 cents above contract lows.
Rains in the US Midwest this week should bolster the grain-filling process in some areas, but traders are monitoring flooding in Wisconsin and potentially excessive moisture in parts of southern Minnesota and northern Iowa.
Ahead of the USDA's weekly export sales report on Thursday, analysts expected the government to report US corn sales at 700,000 to 1,300,000 tonnes (old and new crop years combined).