CBOT November soybeans settled up 19 cents at $9.68-1/2 per bushel after reaching $9.73-1/2, its highest since Aug. 10.
Technical buying noted as the November opened above Friday's high, creating a gap on the contract's chart, a bullish signal.
Additional strength stemmed from export optimism tied to increased demand from top global soy buyer China. The USDA said private exporters sold 136,000 tonnes of US soybeans for China for delivery in the 2017/18 marketing year.
Uncertainty about the path of Hurricane Irma added support, with some traders nervous that the storm could being excessive rains next week to soy areas of the Mississippi River Delta and the southern Midwest.
CBOT December soymeal settled up $9.20 at $308 per short ton, following soybeans higher, while December soyoil fell 0.23 cent at 35.44 cents per lb on meal/oil spreading.
The CBOT reported no deliveries against CBOT September soybean futures, 196 soymeal deliveries and 451 soyoil deliveries.