Benchmark copper on the London Metal Exchange (LME) was up 1.4% at $8,881.50 a tonne by 1700 GMT, extending its recovery from last week's 10-week low of $8,442.
But the metal used in electrical wiring remains locked in a downward trend since prices hit $9,550.50 in January and is far below last year's record high of $10,845.
Demand in top consumer China has recovered more slowly than expected and banking sector turmoil has damaged the outlook for economic growth.
"Price action today will likely be largely dictated by the outcome of the FOMC (Fed) meeting," ING analysts said.
The Fed is expected to raise interest rates by a quarter of a percentage point, but investors will be looking to see how banking instability has affected the central bank's plans.
Global stock markets were cautiously higher while the dollar fell to a five-week low, helping dollar-priced metals by making them cheaper for buyers with other currencies. "Copper is holding up very well," said Bjarne Schieldrop, chief commodities analyst at Swedish banking group SEB.
Rising demand and the difficulty of increasing supply should keep the market tight, he said, predicting prices would average $9,000 a tonne this year and $11,000 in 2024.
In the LME's warehouse system, on-warrant copper inventories have fallen to 38,375 tonnes from about 77,000 at the start of the year. Quickly delivered cash copper has flipped to a premium versus the three-month contract on the LME, pointing to tighter supply. Copper stocks in Shanghai Futures Exchange and COMEX exchange warehouses are also falling. LME aluminium was up 1% at $2,288.50 a tonne, zinc firmed by 0.2% to $2,870, nickel gained 0.1% to $22,545, lead was up 1.1% at $2,117 and tin rose by 1.3% to $23,335.
(Reporting by Peter Hobson Additional reporting by Siyi Liu and Dominique Patton Editing by Kirsten Donovan and David Goodman )
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