U.S. consumer prices rose 0.4% in August, driven by increased costs for gasoline, airfares, and mobile phone services. The Labor Department reported on Friday, September 11, 2026, that annual inflation held steady at 3.4%, matching the year-over-year increase seen in July.
The report followed data released Thursday showing strong readings in the Producer Price Index, a measure of wholesale inflation. These figures contribute to the Personal Consumption Expenditures (PCE) price indexes, which the Federal Reserve monitors to reach its 2% inflation target. Economists noted that persistent energy costs, influenced by the ongoing Iran war, and an expansion in artificial intelligence infrastructure are contributing to current pricing trends.
Core inflation, which excludes volatile food and energy costs, rose 0.3% in August, exceeding economist expectations for a 0.2% gain. Gasoline prices jumped 3.9% during the month, accounting for more than one-third of the total CPI increase, while diesel prices reached a national average of $6 per gallon for the first time. Mobile phone costs rose 5.9%, and airline fares increased 2.7%. Conversely, grocery prices remained unchanged as a drop in produce costs, including a 6.2% decline in lettuce prices following a Cyclospora outbreak, offset a 2.9% rise in egg prices.
The scale of these price increases is also reflected in the broader financial markets and borrowing costs for consumers. U.S. Treasury yields rose following the report, with the 10-year note reaching 4.9915%, and the average 30-year fixed-rate mortgage surpassed 7%. These higher rates increase the monthly cost of debt for prospective homebuyers and those with variable-rate loans. Financial markets responded to the data by increasing the probability of a Federal Reserve interest rate hike from 72% on Thursday to 87% by Friday, indicating that professional investors expect higher borrowing costs to be implemented shortly to curb rising prices.
The report sets a precedent for the Federal Reserve's policy direction through the end of 2026. While President Donald Trump has publicly pressured the central bank to cut rates, economists suggest the current data may compel the Federal Open Market Committee to raise the benchmark overnight interest rate, currently between 3.50% and 3.75%, during their upcoming meeting on September 15-16. Beyond the immediate meeting, analysts suggest further hikes could occur in October or December if inflation does not trend toward the 2% target. The next major data point will be the August PCE inflation report, which is expected to show core inflation rising 0.3% for the month.