ZURICH — The Federal Reserve chair, Jerome H. Powell, said on Friday that the central bank remained committed to keeping the United States economic expansion going, in remarks that signaled he and his colleagues are likely to cut interest rates for a second time at its coming meeting.

“The Fed has, through the course of the year, seen fit to lower the expected path of interest rates,” Mr. Powell said, adding “that’s one of the reasons why the outlook is still a favorable one, despite these crosswinds we’ve been facing.”

“We’re going to continue to act as appropriate to sustain this expansion,” Mr. Powell said, speaking in a question-and-answer session in Zurich.

While Mr. Powell said nothing to cement a coming rate cut, his comments did little to walk back investors’ expectations for a move in September, suggesting that the central bank is comfortable with the outlook that it will act again. His remarks are the Fed’s last chance to foreshadow whether the central bank will cut rates at its next meeting on Sept. 17-18 in Washington. A premeeting quiet period, during which officials do not make public remarks related to monetary policy, starts on Saturday.