Economists expect the US Consumer Price Index (CPI) to rise by 0.6% month-over-month in September and 3.6% year-over-year, indicating an accelerating pace of price growth and further deviation from the Federal Reserve's 2% target. Core inflation, which excludes volatile food and energy prices, is projected to increase by 0.2% month-over-month and 2.5% year-over-year.