US August CPI Accelerates, Core Inflation Stable, Market Eyes Future Trends

2025-09-15

The US Consumer Price Index (CPI) rose 0.4% month-over-month seasonally adjusted in August, up from a 0.2% increase in July, marking the highest monthly gain since January 2025. The annual CPI inflation rate climbed to 2.9%, exceeding July’s 2.7%, and representing the fastest yearly pace this year. Core CPI, which excludes volatile food and energy prices, remained steady at 3.1% year-over-year with a 0.3% monthly rise consistent with July’s figures, indicating persistent underlying inflation pressures. The data reflect a modest acceleration in overall inflation, prompting close market attention to the Federal Reserve’s forthcoming policy moves.

  • Shelter costs increased by 0.4% month-over-month, contributing the largest upward pressure on the overall CPI.
  • Food prices rose 0.5% monthly, with food at home up 0.6% and food away from home up 0.3%, resulting in a 3.2% annual increase for food.
  • Energy prices increased 0.7%, driven by a 1.9% jump in gasoline prices, marking the first positive energy inflation in seven months.
  • Used cars and trucks prices surged 6%, while new vehicle prices rose 0.7% monthly, both remaining significant inflation contributors.
  • Airline fares and apparel prices also showed increases, supporting the monthly CPI gain.
  • Medical care, recreation, and communication services saw slight declines, partially offsetting the overall inflation rise.

In the short term, with continued upward pressure from shelter, food, and energy prices, inflation is expected to maintain a modest acceleration. Markets are closely monitoring the upcoming September 17 FOMC meeting, where the Fed is likely to retain a cautious stance amid sustained inflation. Over the medium term, core inflation is projected to hover around 3% within the next six months due to persistent underlying price pressures and ongoing tariff impacts, suggesting that inflationary forces have yet to fully abate. Market participants should stay vigilant to the Fed’s policy rhythm and its implications for economic and asset price dynamics.