Recent September CPI data, released October 14 at 3.7% year-over-year—up from 3.4% in August and matching consensus—anchors trader positioning for the October annual print, with energy costs driving the acceleration as gasoline surged 9.1% monthly amid ongoing U.S.-Iran tensions. Core CPI rose to 2.6% annually, reflecting firmer underlying pressures from shelter, tariffs, and AI-related demand for electronics and software. The Cleveland Fed nowcast places October at 3.78%, while elevated fuel prices and persistent goods inflation keep upside risks alive. Market-implied odds favor 3.7% at 52%, followed by 3.9% and 4.0%, reflecting uncertainty ahead of the November 10 release and the Fed’s October policy meeting.