"It's going to take some time" for disinflation to spread through the economy, Powell said in a news conference following the Fed's latest quarter-point interest rate increase.
He said he expects a couple more rate hikes still to go, and, "given our outlook, I just I don't see us cutting rates this year."
Rate cuts, they expect, will start in September - a view Powell said Wednesday is driven by the expectation of fast-receding inflation.
Since the 1990s, the interlude between rate hikes and rate cuts has varied from as long as 18 months in 1997-1998 to as short as five months in 1995.
The Fed, Powell said Wednesday, cannot risk doing too little.