Corn and soybeans also turned higher, shaking off early pressure tied to the expanding harvest of both crops in the US Midwest.
As of 1:03 p.m. CDT (1803 GMT), Chicago Board of Trade December wheat was up 8-1/2 cents at $4.62-1/4 per bushel after reaching $4.62-1/2, its highest since Aug. 15.
CBOT November soybeans were up 4-1/2 cents at $9.68 a bushel after falling to $9.58, a two-week low. December corn was up 2 cents at $3.54-1/4 a bushel, rebounding after dipping to a one-week low at $3.48-1/2.
Wheat has been trending higher for most of September and open interest has been declining, a possible sign of commodity funds paring a sizable net short position.
Traders also have been adjusting positions ahead of the US Department of Agriculture's small grains report on Friday, in which analysts expect the government to lower its estimate of US 2017 wheat production.
As well, some analysts noted dry conditions in parts of the Midwest, where farmers are planting the 2018 soft red winter (SRW) wheat crop.
"The drought in US SRW wheat areas, which will not allow winter wheat to germinate until it rains, was supportive for Chicago wheat futures," DC Analysis President Dan Cekander said in a note to clients.
CBOT soybeans and corn turned up despite near-optimal weather in the Midwest that should boost harvest progress. A spell of unseasonably hot weather over the last week likely helped boost crop maturity.
"The weather is looking like it's as good as it gets, and yields are hanging in maybe better than everybody expected. Not a lot of positive news (for prices)," said Mark Schultz, chief analyst at Northstar Commodity Investment Co.
CBOT soyoil futures were lower on follow-through selling, a day after the US Environmental Protection Agency said it was seeking comment on a proposal to reduce biodiesel blending requirements into the domestic fuel supply.
Soybean oil is the primary US feedstock for biodiesel fuel.
Corn firmed. Some market participants have begun scaling back positions ahead of Friday's USDA quarterly stocks report.
Analysts expect the USDA to report US corn stocks as of Sept. 1 at 2.353 billion bushels, which would be the largest Sept. 1 stocks since 1988, if realized.