Corn inched higher after dropping to its lowest since late June on Wednesday, with traders assessing the impact of rainfall in dry parts of the US Midwest crop belt.
Soybean prices rose for a second day, helped by export demand.
The Chicago Board of Trade front-month September wheat had inched down 0.2 percent to $4.18-1/2 a bushel by 1114 GMT, after dropping 2.4 percent in the last session to a contract low at $4.17.
"Fundamentals are bearish for wheat, supplies are really good overall and it is a buyer's market," Phin Ziebell, agribusiness economist at National Australia Bank, said.
"We had weather related issues and there were low plantings in the US but we have big supplies coming from other parts of the world."
Forecasters are expecting a record Russian wheat crop and the bumper volume was reflected in a long list of offers in a tender by Egypt on Wednesday in which the world's largest wheat importer booked 295,000 tonnes of Russian wheat and 60,000 tonnes of Ukraine wheat.
No US wheat was offered in the tender.
In India, meanwhile, farmers harvested a record 98.38 million tonnes of wheat in the crop year to June, data released by the country's farm ministry showed on Wednesday.
The most active CBOT corn contract added 0.2 percent to $3.67-1/4 a bushel, while soybeans gained 1.0 percent to $9.34 a bushel.
Corn and soybeans have been weighed down by improving weather conditions in the Midwest, which coincided with higher than anticipated yield forecasts from the US government in a closely watched Aug. 10 report.
Rain this week and moderate temperatures should benefit Midwest crops, although traders remained cautious about how much moisture would reach some zones that have been dry this summer.
Soybeans drew support from Wednesday's announcement that a delegation of importers from China signed agreements to buy 3.8 million tonnes of US soybeans.
A record Brazilian crop has been expected to take export market share from the United States, but Brazilian farmers have been reluctant to sell even as storage capacity fills up.
"Many (Brazilian) producers are refusing to sell at the current low prices, which leaves local supply stuck at a high level," Commerzbank analysts said in a note.
"This supply is likely to flood the market if prices rise, and should therefore limit price increases."
Grain markets will get a further indication of export demand in weekly US export sales data due at 1230 GMT.