NEW YORK (Reuters) - Reduced expectations for another U.S. Federal Reserve interest rate hike this year helped drive down the dollar to its lowest in more than 2-1/2 years on Friday and kept gold near a one-year high.

The euro hit multi-year peaks in the wake of a European Central Bank meeting, while U.S. crude oil prices tanked more than 3 percent as powerful Hurricane Irma roared toward Florida.

Stubbornly weak inflation continues to surprise Fed policymakers. In a speech on Thursday, New York Fed President William Dudley did not repeat an assertion from three weeks ago that he expects to raise rates once more this year.

Also dampening the dollar and lowering the chances of another rate hike was an agreement in Congress to push U.S. debt ceiling talks three months down the road to December, coinciding with the Fed’s policy meeting.

Against a basket of other major currencies, the dollar index .DXY was down 0.38 percent after touching a low of 91.011, its weakest since January 2015.

The safe-haven Japanese yen JPY= also strengthened 0.61 percent versus the greenback at 107.80 per dollar, and the euro EUR= rose 0.12 percent to $1.2036.

The euro’s rally built on ECB President Mario Draghi’s suggestion that it may begin tapering its massive stimulus program this fall.

Draghi referred several times Thursday to the euro’s strength and said it was the main reason for a cut in the bank’s 2018-19 inflation forecasts. He also indicated any winding down of its massive stimulus program was likely to be slow.

Those comments did little to deter euro bulls, however, and a Reuters report that central bank officials were in broad agreement that their next step would be to reduce their bond purchases also supported the currency.

A trader works on the floor of the New York Stock Exchange (NYSE) in New York, U.S., September 8, 2017. REUTERS/Brendan McDermid

The ECB “left the mystery out there” with regard to tapering, said Greg Anderson, global head of foreign exchange strategy at BMO Capital Markets in New York. “It creates a feeding frenzy, and the momentum that was there (in the euro) gets accelerated.”

Oil prices fell sharply on worries that energy demand would be hit by Irma, one of the most powerful storms to near the United States in a century, as it barreled toward Florida and the U.S. Southeast.

Irma is the second major storm to threaten the United States in two weeks after Hurricane Harvey shut a quarter of U.S. refining capacity and 8 percent of U.S. oil production.

“Hurricanes can have a lasting effect on refinery and industry demand,” said Eugen Weinberg, head of commodities research at Commerzbank in Frankfurt.

U.S. crude CLcv1 fell 3.12 percent to $47.56 per barrel and Brent LCOcv1 was last at $53.76, down 1.34 percent.

Economists have said Harvey could weigh on U.S. economic growth in the third quarter.

Spot gold XAU= was down 0.2 percent to $1,346.52 an ounceafter hitting $1,357.54, its highest since August 2016. It was up 1.7 percent this week, notching a third consecutive weekly gain.

U.S. shares were mixed, with the S&P ending slightly lower as investors braced for Irma and fretted that Pyongyang could launch another missile test on Saturday, North Korea’s founding day, keeping risk appetite in check going into the weekend.

The Dow Jones Industrial Average .DJI rose 13.01 points, or 0.06 percent, to end at 21,797.79, the S&P 500 .SPX lost 3.67 points, or 0.15 percent, to 2,461.43 and the Nasdaq Composite .IXIC dropped 37.68 points, or 0.59 percent, to 6,360.19.

Stocks elsewhere were slightly higher.

The pan-European FTSEurofirst 300 index .FTEU3 rose 0.17 percent and MSCI's gauge of stocks across the globe .MIWD00000PUS edged up 0.01 percent.

The U.S. 10-year Treasury yield fell to a 10-month low of 2.016 percent but then rose, with the benchmark notes last up 2/32 in price to yield 2.0559 percent.