* Brazilian soybeans need rain, some forecast

* Bargain-hunting lifts wheat, corn

HAMBURG, Nov 27 (Reuters) - Chicago soybeans rose from their lowest in around three weeks on Monday as dealers waited to see how much urgently needed rain would fall in Brazilian crop areas after leading consultants cut harvest forecasts.

Wheat and corn firmed on buying interest after Friday’s falls.

Chicago Board of Trade most-active soybeans were up 0.4% to $13.37-1/4 a bushel at 1212 GMT after earlier sliding to their lowest since Nov. 2 at $13.23-1/2 a bushel. Soymeal rose 1.4%.

Wheat rose 0.3% to $5.79-3/4 a bushel. Corn rose 0.1% to $4.64 a bushel.

"For soybeans, the market focus is all about Brazilian weather and the possible impact on crops," said Matt Ammermann, StoneX commodity risk manager.

"Some welcome rain was forecast this week after crop forecast downgrades, but markets are waiting to see how much actually falls."

"Soybeans are also being supported by rising soymeal, with more U.S. demand expected in the next couple of months if there are South American crop delays."

Consultancies Safras & Mercado and hEDGEpoint on Friday reduced estimates of Brazil's soybean crop after bad weather including dryness.

Brazil's soybean sowing continues to lag behind last year's levels.

U.S. soybean export sales are brisk, with U.S. exporters selling 129,000 tons of U.S. soybeans to China and another 323,400 tons of U.S. soybeans to unknown buyers.

"Wheat and corn are seeing some bargain buying and short-covering after their recent falls," Ammermann said.

"With Russian wheat the cheapest in the export sector, markets will be sensitive in coming weeks to any disruption to Black Sea shipments by the weather or Ukrainian conflict."

Some new purchasing demand for wheat was seen, with international tenders issued on Monday by Pakistan and Bangladesh. But cheap Black Sea wheat, especially from Russia, was tipped to win the business. (Reporting by Michael Hogan in Hamburg, Additional reporting by Naveen Thukral; Editing by Janane Venkatraman, Mrigank Dhaniwala and Jan Harvey)