The U.S. dollar edged back from near a two-decade peak against a basket of major currencies on Thursday as investors looked to a speech by Federal Reserve Chair Jerome Powell the following day for fresh clues on the path for monetary policy.

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The dollar index, which measures the greenback against six counterparts, eased 0.15 per cent to 108.47, but remained not far from its highest since September 2002 at 109.29, touched in mid-July.

Investors have been bracing for the Fed to double down on its commitment to crushing inflation at its annual gathering in Jackson Hole, Wyoming.

Money markets have pared back expectations that the U.S. central bank could tilt to a slower pace of rate hikes following a chorus of hawkish Fed commentary in recent weeks, and currently lay 60.5 per cent odds on another super-sized 75 basis-point rate hike next month versus 39.5 per cent probability of a half point increase.

"Expectations of a hawkish message from FOMC Chair Powell at Jackson Hole will likely keep upward pressure on the USD," Commonwealth Bank of Australia analyst Kristina Clifton wrote in a client note.

"However there is a risk that the speech is deemed not hawkish enough and that we see some retracement in the USD."

The dollar retreated 0.25 per cent to 136.775 yen, but remained not too far from this week's one-month high of 137.705.