Traders see September 2026 U.S. CPI month-over-month near 0.5–0.6% as the most probable outcomes because August’s hotter-than-expected 0.4% headline and 0.3% core prints—driven by a 3.9% gasoline surge and persistent shelter and services gains—left inflation stickier than hoped. With the year-over-year rate holding at 3.4% and the Federal Reserve signaling vigilance, market-implied odds reflect balanced bets on whether cooling labor data and base effects will moderate the print or energy and housing pressures will keep it elevated ahead of the October 14 release. This tight distribution underscores uncertainty in the near-term inflation path versus the Fed’s 2% target.