US benchmark West Texas Intermediate for delivery in October jumped USD 2.00, or 4.1 per cent, to USD 46.68 a barrel on the New York Mercantile Exchange, nearly erasing Friday's loss.
Brent North Sea crude for November finished at $48.92 a barrel in London, up USD 1.45 from Friday's settlement.
"It's really the technicals that are driving the market," said Ted Sloup of iiTrader, noting that trade volumes were thin.
Sloup said the drop in the US oil rig count on Friday gave traders "an excuse" to buy. "But there's a ton of crude out there," he said.
Prices had sunk Friday after the US Federal Reserve expressed doubts about the strength of the global economy as it held off from an interest rate hike.
"There has been so much uncertainty surrounding the latest(Fed) meeting which has caused increased volatility" in the oil market, Myrto Sokou, senior analyst at Sucden brokers, said.