August CPI Report to Shape Fed Rate Hike Odds Before Meeting

The August CPI report, due Friday, carries extra importance as the last inflation figure the Federal Reserve will examine before its September 15-16 meeting. Thursday's hotter-than-expected producer price index already raised the market-implied probability of a 25-basis-point rate hike to above 70% on the CME FedWatch tool, compared with about 62% before that release. A core CPI reading matching the 0.22% median estimate from 17 banks surveyed by the Wall Street Journal would likely leave those probabilities steady. A reading significantly above that level would reinforce hike expectations and might push Treasury yields still higher following their sharp increase on Thursday.

On the other hand, a core reading softer than anticipated would add real uncertainty to an outcome that currently appears nearly settled. Energy costs represent an unpredictable factor outside the core figure, as oil's climb above $100 a barrel due to Middle East tensions is projected to affect the headline measure more than the core. Traders will therefore likely analyze the two numbers separately rather than reacting to just the headline.

Friday's CPI essentially acts as the deciding factor for whether the Fed raises rates next week, and Wall Street's projections are remarkably concentrated around a 0.2% core figure.

Key details:

• The Bureau of Labor Statistics will issue the August CPI report on Friday, September 11 at 8:30am ET, the last inflation data before the Fed's September 15-16 meeting
• Median projections from 17 banks surveyed by the Wall Street Journal show headline CPI at 0.38% month over month (3.4% year over year) and core CPI at 0.22% month over month (2.4% year over year)
• Each of the 17 individual core CPI estimates, spanning 0.16% to 0.24%, rounds to 0.2%, an unusually narrow consensus
• Thursday's PPI report indicated strong pricing in components that influence the Fed's preferred PCE inflation metric, raising the chance that a CPI print in line with consensus could result in a slightly firmer core PCE reading for August
• After Thursday's PPI data, CME FedWatch pricing put the probability of a 25-basis-point September rate hike above 70%, up from roughly 62% before the release
• Rising oil prices linked to Middle East tensions are expected to boost the headline figure more than the core reading, adding complexity to how markets interpret Friday's data

The August CPI report on Friday is more consequential than typical, arriving as the final major inflation indicator the Fed will examine prior to its September 15-16 meeting, where Chair Kevin Warsh and other officials will decide whether to implement the first rate increase since 2023. The Bureau of Labor Statistics will publish the data at 8:30am Eastern time. Economists broadly concur that the result could sway a finely balanced decision in either direction.

A median headline CPI of 0.38% month over month, equivalent to 3.4% year over year, and a median core CPI of 0.22% month over month and 2.4% year over year come from forecasts by 17 banks compiled by the Wall Street Journal. Notably, the core estimates are remarkably concentrated: all 17 individual projections, from 0.16% to 0.24%, round to 0.2%. Such consensus is fairly uncommon and implies economists foresee little chance of a large surprise in the underlying trend, even though the actual reading will still affect market pricing.

Thursday's producer price index report increased the stakes, arriving hotter than forecast with strong readings in components that directly influence the Fed's favored inflation measure, the personal consumption expenditures index. This suggests that even a CPI result in line with consensus might lead to a somewhat stronger core PCE number for August than currently priced in. Right after Thursday's PPI release, traders elevated the likelihood of a 25-basis-point rate hike at next week's meeting above 70% on the CME FedWatch tool, from about 62% previously, based on market pricing.

Energy costs introduce another element to Friday's report. Oil prices have climbed above $100 a barrel as Middle East tensions escalate, a development expected to affect the headline CPI more than the core measure, which excludes food and energy. That distinction means market participants will likely assess the two figures separately: a strong headline number driven primarily by energy would send a different policy signal than a core reading that surprises on the upside due to more persistent, demand-driven price increases. With futures already leaning toward a rate increase and forecasts unusually concentrated around a 0.2% core reading, Friday's data could either validate what markets have already priced in or, if it strays significantly from consensus, reintroduce genuine uncertainty ahead of next week's Fed decision.