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US Inflation Accelerates to 3.4% Amid Oil Price Spike

By Markets Desk · 2026-09-12 · 1 min read
A gas pump nozzle resting on a concrete surface next to a row of vintage fuel cans
Illustration: Tradingbird

Monthly consumer prices jumped 0.4% in August, quadrupling the previous gain and complicating Federal Reserve policy decisions.

US inflation accelerated in August, with the consumer price index rising 3.4% year over year. The monthly increase stood at 0.4%, quadrupling the 0.1% gain recorded in July. Gasoline prices drove much of this shift, climbing 3.9% month over month. The national average for a gallon of gas reached $4.30 on Friday, marking a 7% rise from the previous month. These figures arrive seven weeks before midterm elections, heightening political pressure on economic policymakers.

Energy Costs Drive Broad Price Increases

Diesel prices have exceeded $6 per gallon, setting new records and raising shipping costs. Airlines saw ticket prices rise 2.7% in August, accumulating a 23% increase from a year earlier. Hotel rates climbed 2.4% monthly, while car repair costs also jumped. Core inflation, excluding food and energy, ticked up 0.3% from July to August. This was the largest core monthly gain since April, despite the year-over-year rate falling slightly to 2.4%.

Fed Rate Hike Probability Jumps

Market expectations for a Federal Reserve rate increase on September 16 surged past 80%. This represents a 10-point jump from Thursday, according to CME Fedwatch data. Fed officials have signaled that continued disinflation is required to hold rates steady. The August report failed to meet that threshold, according to Kathy Bostjancic, chief economist at Nationwide. The yield on the 10-year Treasury reached a nearly three-year high of 4.9% on Friday.

Political Responses to Inflation Concerns

President Donald Trump proposed $5,000 payments to adults if Republicans retain their congressional majority. Treasury Secretary Scott Bessent increased bond buybacks to suppress long-term interest rates. Consumer sentiment reflects the strain, with households cutting back on dining and entertainment. One worker noted rent increased by $200 this year to $2,300. He is seeking a raise to cover basic living costs, stating previous increases no longer keep pace with expenses. The data from GN markets/policy (en-US) underscores the persistent challenge of cost-of-living pressures.

Based on reporting by Santa Cruz Sentinel, compiled by the Tradingbird desk.

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