Brent crude futures were up 24 cents, or 0.3%, to $91.08 a barrel as at 0315 GMT, but were down 1.9% for the week so far.
U.S. West Texas Intermediate (WTI) crude futures gained 10 cents, or 0.1%, to $85.20 a barrel, but were also down 1.9% on a weekly basis.
"Today's morning rebound for oil prices can only be described as a short-term correction, as the Fed will raise interest rates by 75bp or 100bp next week," said Leon Li, an analyst at CMC Markets.
"Although the probability of a 100 bp rate hike is relatively small, it would bring uncertainty to market sentiment. So there is still a risk that oil prices could drop lower next week."
Both benchmarks are headed for a third consecutive weekly loss, hurt partly by a strong U.S. dollar, which makes oil more expensive for buyers using other currencies. The dollar index ticked down on Friday but held near last week's high above 110.
Investors are bracing for a U.S. rate hike next week after data showed underlying inflation broadening out, and amid growing concerns of a global recession.
The market was also rattled by the International Energy Agency's outlook for almost zero growth in oil demand in the fourth quarter due to a weaker demand outlook for China.
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