Today Markets Analysis: US inflation accelerated in August as gasoline prices surged, while core inflation also came in above expectations. The combination of renewed energy-price pressure and persistent underlying inflation has strengthened expectations for tighter Federal Reserve policy, pushing Treasury yields higher and weighing on the economic outlook even as US equity futures found some relief.
US CPI Accelerates as Gasoline Prices Surge
US consumer prices increased 0.4% month-on-month in August 2026, accelerating sharply from 0.1% in July and matching expectations.
The increase was the largest monthly rise in three months and was driven primarily by a 3.9% jump in gasoline prices, reflecting the sharp increase in crude oil prices amid escalating tensions between the US and Iran.
Shelter costs also accelerated, rising 0.3% compared with 0.1% in July, while food prices increased 0.1% for a second consecutive month.
Additional upward pressure came from communication services, lodging away from home, airline fares, education and used cars and trucks. These increases were partly offset by declines in medical care and motor vehicle insurance costs.
The annual headline inflation rate remained at 3.4%.
Core Inflation Exceeds Expectations
The more closely watched core CPI measure, which excludes food and energy, increased 0.3% month-on-month, compared with 0.2% in July and above the 0.2% market forecast.
However, the annual core inflation rate eased to 2.4%, down from 2.5% in July and its lowest level since March 2021.
The combination creates a complicated picture for the Federal Reserve. Annual underlying inflation continues to move lower, but the stronger monthly reading suggests that the disinflation process remains uneven.
More importantly for markets, renewed energy inflation risks feeding into broader price expectations if elevated oil prices persist.
Treasury Yields Remain Near Elevated Levels
The US 10-year Treasury yield remained around 4.92%, close to its highest levels since 2023.
Following the CPI release, expectations for a Federal Reserve rate increase at next week’s meeting strengthened significantly. Markets moved to price approximately a 90% probability of a hike, compared with around 70% before the inflation data.
The rise in rate expectations reflects the stronger-than-expected monthly core CPI reading and continued concerns surrounding energy-driven inflation.
For longer-duration bonds, the combination of higher inflation expectations and tighter monetary policy creates a challenging environment, particularly while oil prices remain elevated.
Equity Futures Find Some Relief
Despite the inflation data, US equity futures moved higher on Friday, ending a four-session losing streak.
Contracts linked to the S&P 500, Dow Jones and Nasdaq 100 were around 0.7% higher, as oil prices and Treasury yields temporarily paused their recent advances.
The recent market weakness has been closely linked to the sharp rise in energy prices following the escalation of US-Iran tensions in the Persian Gulf. A stabilisation in crude therefore provided some relief for equities even as inflationary risks remained elevated.
Credit-sensitive areas of the market, including heavily indebted AI infrastructure companies and banks, remained under pressure during the week, highlighting concerns over the effect of higher financing costs.
Consumer Sentiment Falls as Inflation Expectations Rise
The University of Michigan’s preliminary consumer sentiment index fell to 47.8 in early September, down for a second consecutive month and well below the 51.0 market expectation.
The reading represented the weakest level since May’s record low and reflected growing concerns about household finances and economic conditions.
Consumers are increasingly concerned about higher fuel costs and trade tensions, with year-ahead inflation expectations jumping to 4.6%, the highest level since June.
Five-year inflation expectations also edged higher to 3.4%, from 3.3%.
Overall sentiment is now approximately 16% below February levels and 13% below the level recorded a year earlier.
The deterioration is important because higher inflation expectations can become self-reinforcing if households and businesses begin adjusting spending, wages and pricing behaviour accordingly.
The Fed Faces a Difficult Policy Balance
The latest data leaves the Federal Reserve facing a difficult trade-off.
On one side, annual core inflation has continued to decline and consumer sentiment is weakening. On the other, monthly core inflation has accelerated, gasoline prices have surged and energy markets remain vulnerable to further geopolitical disruption.
A rate increase could reinforce the Fed’s inflation-fighting credibility, but tighter policy also risks putting additional pressure on households, businesses and credit-sensitive parts of the economy.
This creates an increasingly important question for markets: how much of the recent inflation pressure is temporary and energy-driven, and how much is becoming embedded in the broader economy?
Today Markets View
The August CPI report does not represent a broad-based inflation acceleration across every category, but it does highlight the difficulty of declaring victory over inflation while energy prices remain elevated.
The decline in annual core inflation is encouraging, yet the stronger monthly reading and rising inflation expectations give the Federal Reserve a reason to remain cautious.
“The US inflation picture is becoming increasingly two-sided. Annual core inflation continues to improve, but the acceleration in monthly core prices and the surge in gasoline costs are making it harder for the Fed to ease policy without risking a renewed inflation impulse.”
— Louis Roche, Analyst, Today Markets
For traders and investors, the relationship between oil, inflation, Treasury yields and Federal Reserve policy is likely to remain one of the dominant themes across US markets. Today Markets continues to monitor these cross-asset developments, while Currency Hedger focuses on the implications for currencies, rates and global macro markets.
Analysis by Louis Roche, Analyst, Today Markets
Currency Hedger Contributor: Currency Hedger Market Intelligence
