US Inflation Reaches 3.7% in September as Surge in Energy Prices Drives CPI Acceleration

U.S. consumer prices accelerated in September, with the Consumer Price Index rising 0.6% from August and 3.7% compared with the prior year. A 9.1% monthly spike in gasoline costs generated more than half of the overall monthly inflation gain, while the broader energy index expanded 5.2% for the month following market disruptions linked to conflict involving Israel, the U.S., and Iran. Core inflation, which excludes volatile food and energy costs, climbed 0.3% month-over-month and 2.6% annually.

The broader uptick in price pressures eroded consumer purchasing power, as real average hourly earnings dropped 0.5% from August and fell 0.7% year-over-year. Although White House economic adviser Kevin Hassett described the energy jump as temporary, noting flat food costs and a 1.2% drop in prescription drug prices, elevated fuel expenses continue to weigh on households. Market funds reflected the broader pressure, with the United States Gasoline Fund LP (AMEX:UGA) falling 0.12% to $146 and the United States Natural Gas Fund LP (AMEX:UNG) declining 1.67% to $11.22.

Investors are watching whether persistent energy volatility will keep inflation higher for longer. The stronger September price data has renewed expectations that the Federal Reserve could maintain higher interest rates to bring persistent price increases across shelter, travel, and services under control.