FX.co ★ US September CPI Inflation Accelerates to 3.7% YoY, Ending Two-Month Cooling Trend

U.S. consumer price inflation picked up in September 2026, with the headline Consumer Price Index (CPI) rising 3.7% year-over-year, up from 3.4% in August. The latest data, updated on 14 October 2026, signals a renewed acceleration in price growth after the previous month’s softer reading.

The figures are based on a year-over-year comparison, meaning September’s 3.7% gain measures price changes relative to September a year earlier, while August’s 3.4% reflected changes versus August the prior year. The uptick suggests inflationary pressures remain persistent in the U.S. economy, complicating the outlook for policymakers and markets that had been looking for a more sustained easing in price growth.

With the September reading marking a clear step up from August, analysts and investors will be closely watching upcoming data to determine whether this move represents a temporary bump or the start of a renewed inflationary trend in the United States.