The contracts now show that traders see a 66 percent chance that the first Fed rate hike will come in October 2015, based on CME FedWatch, which tracks rate hike expectations using its Fed funds futures contracts.

Before the Fed's post-meeting statement, traders saw a 65 percent chance of an October 2015 rate hike.

The Fed has kept short-term rates near zero since December 2008.

(Reporting by Ann Saphir; Editing by Chris Reese)