U.S. consumer inflation accelerated in August, while underlying price pressures came in slightly stronger than expected.
The data increased expectations that the Federal Reserve could raise interest rates next week, with markets assigning a high probability to a quarter-point move.
U.S. Inflation Accelerates in August
Headline consumer prices rose 0.4% month over month in August, matching expectations and accelerating from July’s 0.1% increase.
On an annual basis, the Consumer Price Index remained at 3.4%, in line with both forecasts and the previous month.
The stronger monthly increase reflected a sharp rise in energy costs.
Gasoline Prices Drive Headline CPI Higher
Gasoline prices jumped 3.9% from the previous month, accounting for more than one-third of the overall increase in consumer prices.
The broader energy index also rose 2.1%.
Average U.S. gasoline prices increased to around $4.192 per gallon in August, compared with $4.064 in July.
Higher fuel prices had already raised concerns that energy costs could keep inflation elevated.
Oil and Geopolitical Risks Add Pressure
Energy markets have remained under pressure because of continued geopolitical tensions involving Iran.
Disruptions to shipping through the Strait of Hormuz have raised concerns about global oil supplies, while instability around the Bab el-Mandeb Strait has created additional uncertainty.
Brent crude moved above $100 per barrel this week, adding to fears that energy costs could remain elevated.
Higher oil prices can quickly feed into transportation, production and consumer costs.
AI Spending and Tariffs Could Lift Prices
Other factors may also be contributing to inflation pressures.
Heavy investment in artificial intelligence infrastructure has increased demand for products such as memory chips, data storage equipment and certain electronics.
Fresh U.S. tariffs on Canada could also add to price pressures in the months ahead.
These factors may make it more difficult for inflation to return sustainably to the Federal Reserve’s 2% target.
Core CPI Comes In Hotter Than Expected
Core CPI, which excludes food and energy, increased 0.3% month over month.
Economists had expected a 0.2% rise, matching July’s pace.
On an annual basis, core inflation eased to 2.4% from 2.5%, in line with expectations.
Prices for hotels, air travel, education and used vehicles increased during the month.
Those gains were partly offset by lower medical care and auto insurance costs.
Supercore Inflation Remains Elevated
Federal Reserve officials also monitor inflation measures that exclude especially volatile categories.
So-called supercore inflation, which focuses on services excluding energy and housing, rose 0.5% month over month.
On an annual basis, the measure increased 3%.
The figure suggests that underlying service inflation remains a concern for policymakers.
Fed Rate Hike Odds Jump After CPI
Federal Reserve officials have repeatedly stressed that inflation remains a major priority.
Markets responded to the latest CPI report by raising the probability of a 25-basis-point Fed rate hike to around 86%, according to CME FedWatch.
That was up from roughly 70% before the inflation data.
CIBC Economics analysts said the stronger-than-expected core inflation reading reinforced the likelihood of a rate increase at the upcoming FOMC meeting.
Markets Show Limited Initial Reaction
Financial markets reacted relatively calmly to the report.
U.S. stock futures held on to earlier gains, while the rate-sensitive 2-year Treasury yield moved slightly higher.
The benchmark 10-year Treasury yield edged lower.
The muted reaction suggests that investors had already priced in much of the inflation risk before the report.
Fed Still Faces a Difficult Decision
Despite growing expectations for a rate increase, some policymakers have suggested that keeping rates unchanged remains possible.
Fed Governor Christopher Waller has indicated that waiting another meeting could allow policymakers to see whether inflation continues to ease.
New York Fed President John Williams has also said monetary policy remains in a relatively good position, although he remains open to further tightening if economic data justifies it.
Fed Chair Kevin Warsh has avoided giving markets a detailed path for future interest rates.
Instead, he has emphasized that policymakers need convincing evidence that inflation is moving back toward target at an acceptable pace.
Political Pressure Adds Another Challenge
The Federal Reserve also faces political pressure ahead of its next decision.
President Donald Trump has strongly opposed higher interest rates and has warned of economic consequences if the Fed continues tightening policy.
That leaves policymakers balancing persistent inflation against financial, economic and political risks.
With inflation still elevated and market expectations heavily tilted toward another hike, the upcoming Federal Reserve meeting is likely to be closely watched across global markets.
