Highlights
- US August CPI held at 3.4% annually, matching forecasts, while core CPI rose a hotter-than-expected 0.3% month-over-month.
- Gasoline prices jumped 3.9%, driving over a third of the headline gain as Middle East tensions keep energy costs elevated.
- Fed rate-hike odds for next week's meeting jumped to roughly 90% on CME FedWatch, with Polymarket traders pricing 83%.
- Goldman Sachs and Principal Asset Management economists both said the report keeps the door open to more than one hike this cycle.
- Treasury yields and gold whipsawed within minutes of the release as traders repriced the rate path.
An In-Line Headline, a Hotter Core
The US Bureau of Labor Statistics reported August CPI rose 0.4% month-over-month and 3.4% year-over-year on Friday, matching economist forecasts on the headline figure. Core CPI, which strips out food and energy, rose 2.4% annually, its lowest reading in 66 months, but the 0.3% monthly gain came in hotter than the 0.2% consensus estimate. The data, the final major inflation print before the Federal Reserve's rate decision next week, immediately reshaped market expectations: fed funds futures tracked by CME Group's FedWatch tool jumped to roughly 90% odds of a hike, sharply higher than prior pricing, as traders concluded persistent underlying price pressure outweighs the reassurance of a headline number that matched consensus.
Gasoline and a Blind Spot in the Data
Energy costs did the heavy lifting in August's report. Gasoline prices jumped 3.9% month-over-month, accounting for more than a third of the headline CPI increase, while the broader energy index rose 2.1% for the month and 16.3% year-over-year as Middle East tensions kept crude and refined-product prices elevated. Crucially, the report's survey window predates the latest leg higher in energy and metals prices, meaning the 3.4% headline figure may understate pressure still building in the pipeline, which extends a run that already saw a hot producer-price print send Treasury yields to a 19-year high and hike odds to 70% earlier this cycle.
Prediction markets moved fast. On Polymarket, traders priced an 83% probability of a 25-basis-point hike at the September FOMC meeting versus 18% for a hold, following the release. Wall Street's own economists read the report the same way: Goldman Sachs economist Alexandra Wilson-Elizondo said the data does not eliminate the possibility of stronger price pressures ahead, since the survey predates the latest commodity rally, while Principal Asset Management's Seema Shah argued the Fed is unlikely to stop at a single hike after five straight years of above-target inflation, telling clients the debate has shifted from whether the Fed hikes to how many times this cycle requires.
Related: US Inflation Stays Above Fed's 2% Target as Tariffs and Oil Prices Keep Pressure On
Stocks, Gold and Yields Whipsaw
Broader markets reacted immediately and violently. Stocks and gold were crushed in the minutes after the 8:30am ET release, then fully erased their declines and turned positive twenty minutes later as traders digested the in-line headline over the hotter core print. The 10-year Treasury yield spiked to a high of 4.99% immediately after the release before reversing to trade lower on the day, a whipsaw that underscored how unsettled positioning has become after markets spent early 2026 pricing a third consecutive Fed rate cut for this very month. Gold told a similar story, tumbling toward roughly $4,290 an ounce in the immediate aftermath before rebounding more than $70 to reclaim $4,360. CNBC reported the release is the final major inflation indicator the Fed will see before next week's policy meeting, a sharp reversal in mood from prior weeks, when easing rate-hike bets had fueled a rally that sent Bitcoin back above $80,000.
What Comes Next
All eyes now turn to the Federal Reserve's policy meeting, which concludes Wednesday, September 16, with Chair Warsh set to announce the rate decision after previously staying tight-lipped on the Fed's next move. Markets have already priced in the outcome with unusual conviction: traders who spent early 2026 expecting a third consecutive cut this month now watch a Fed weighing its first hike in three years. Investors will also parse the accompanying statement for guidance on whether policymakers, as Principal's Shah suggested, signal an extended hiking cycle rather than a one-and-done move. Given the CPI survey's blind spot on the latest commodity rally, any fresh energy-price data before Wednesday could shift odds further and test the in-line-print rally that lifted stocks and gold within twenty minutes of Friday's release.
FAQ
What did the August CPI report show?
Headline CPI rose 3.4% year-over-year and 0.4% month-over-month, matching forecasts, while core CPI rose 2.4% annually, the lowest in 66 months, but 0.3% monthly, hotter than the 0.2% expected.
Why did rate-hike odds jump after a report that matched forecasts?
The hotter-than-expected monthly core reading and rising energy costs suggested inflation pressure is still building, pushing CME FedWatch odds of a September hike to roughly 90% and Polymarket to 83%.
How did markets react to the CPI release?
Stocks and gold initially fell before fully reversing within 20 minutes, the 10-year Treasury yield spiked to 4.99% before pulling back, and gold dropped near $4,290 before rebounding above $4,360.
When does the Fed announce its rate decision?
The Federal Reserve's policy meeting concludes Wednesday, September 16, with Chair Warsh set to announce whether the central bank raises rates for the first time in three years.
