The U.S. inflation rate climbed in September 2026, driven primarily by surging gasoline and energy prices amid the ongoing Iran war. The consumer price index (CPI) rose by 3.7% year-over-year, up from 3.4% in August, according to the Bureau of Labor Statistics. The "core" CPI, which excludes volatile food and energy prices, also increased to 2.6% from 2.4%. Economists, such as Mark Zandi of Moody's, attributed much of this rise to the Iran war, noting its significant impact on inflation.
With midterm elections approaching, rising prices and higher Treasury bond yields are putting financial pressure on households. The Federal Reserve may respond by raising interest rates to curb inflation, which has remained above its 2% target for over five years. Economists predict the Fed will continue hiking rates into spring 2027. Consumer sentiment has plummeted, reflecting widespread frustration over the cost of living, as highlighted by the University of Michigan's consumer sentiment index hitting a near-record low.
The Social Security Administration announced a 3.6% cost-of-living adjustment for 2027, though many respondents in an AARP survey believed this increase would not be sufficient. The Iran war has disrupted oil supplies through the Strait of Hormuz, leading to higher fuel prices. Gasoline prices surged 9.1% in September alone, while diesel prices rose 68% since the war began in February. These increases are affecting transportation costs and broader economic sectors, including manufacturing and agriculture.
Other factors contributing to inflation include tariffs, increased demand for AI data center chips, and strong consumer spending on travel and luxury goods. Despite some relief in grocery prices, economists warn that inflationary pressures are likely to persist, with full recovery in energy prices potentially delayed until mid-2027.