Fed Ahead of Key Inflation Data: Which Scenarios Will Drive Markets This Week

The US Federal Reserve faces its September meeting under intense scrutiny, with market probability for a rate hike swinging between 42 and 60 percent. Conflicting signals from inflation data and the labor market are creating uncertainty among investors about the monetary policy course.

Inflation data show mixed picture

US consumer prices rose 3.4 percent year-over-year in July 2026, down from 3.5 percent in June. The figure met economists' expectations. Core inflation, which excludes volatile energy and food prices, fell from 2.6 to 2.5 percent. On a monthly basis, the Consumer Price Index (CPI) rose 0.1 percent.

Much less reassuring is the trend in the Personal Consumption Expenditures Price Index (PCE), the Federal Reserve's preferred inflation measure. Analysts estimate core inflation by this measure for July at around 3.0 percent—well above the Fed's 2 percent target. The Cleveland Fed, which publishes daily inflation forecasts, projected on September 4 a decline in the CPI to 3.38 percent for August and 3.3 percent for September.

The structure of inflation is concerning observers: while falling hotel prices in July pushed down core inflation—an effect deemed unsustainable—more categories of core goods recorded price increases than in the prior month. Technology prices in particular climbed due to demand for equipment and services in the artificial intelligence field. Gasoline prices fell, however, dampening overall inflation.

Market expectations fluctuate with each data release

The probability of a September rate hike, derived from futures market data, went through several reversals. Before the release of labor market data, it stood at around 52.4 percent. Following robust employment figures, it climbed to around 60.3 percent, as a resilient labor market appeared to signal room for tighter monetary policy.

Publication of July inflation data on August 12 triggered a reversal. Equity futures rose, Treasury yields turned negative, and traders reduced the probability of a September rate hike to 42 percent, according to CME Group FedWatch. Reuters reported that traders increasingly bet on a hold scenario.

As recently as late August, market participants saw little probability of a rate hike before December. This assessment changed fundamentally within days—apparently driven by labor market data signaling economic strength.

Fed official Waller dampens rate hike expectations

Christopher Waller, a Federal Reserve governor, expressed caution on September 4 about the need for further rate moves. He stated that rates could remain at their current level as long as inflation continues to weaken. The statement likely gives backing to advocates of a wait-and-see approach.

The Federal Reserve decided in July 2026 by a vote of 9 to 3 to keep its policy rate in the range of 3.50 to 3.75 percent, where it has been since December 2025. The three dissenting votes point to potential shifts in voting coalitions should circumstances change.

Geopolitical risks burden energy prices

US Treasury Secretary Scott Bessent warned on August 31 at the G20 summit against raising rates in response to supply shocks absent signs of second- or third-round inflation effects. He called core inflation "very, very subdued." Bessent pointed to the ongoing conflict between the US and Iran, which has largely blockaded the Strait of Hormuz—the waterway through which about 20 percent of global oil supplies flowed before hostilities erupted in late February 2026. Global fuel prices rose again in August.

The debate over causes of elevated inflation shapes monetary policy discussion: is it primarily supply-driven price shocks from geopolitical tensions and commodity shortages, or is there demand-driven overheating requiring more restrictive measures?

Analysts divided on September decision

Assessments of the probability of a rate hike vary widely among observers. Forbes argued on August 12 that, despite declining July inflation, the Federal Reserve would likely raise rates in September. The reasoning cited a broadening of price increases across more categories. The New York Times reported on September 3 that elevated inflation—particularly through the AI spending boom—has prompted Fed officials to consider a rate hike for the September meeting.

Reuters reached the opposite conclusion on August 12: Fed policymakers would likely feel little additional pressure to hike rates in September following weak inflation data. The slowdown in year-over-year price growth argued for restraint. CNBC reported on August 31 on differing interpretations of comments by Fed official Kevin Warsh, with some observers seeing an endorsement of a rate hike while others expressed doubt.

Conflicting signals complicate forecasts

The mix of factors facing the Federal Reserve is complex: the labor market continues to defy the expectations of many economists and shows surprising resilience. This strength argues for economic vigor but simultaneously increases pressure on the central bank to remain restrictive. At the same time, headline inflation is trending downward, while core inflation stubbornly remains above target.

Structural challenges—from AI-driven technology demand to geopolitical energy risks to the question of price increase breadth—permit no clear monetary policy answer. Whether the Federal Reserve this week puts greater emphasis on moderating headline inflation or persistent core inflation will likely significantly influence market direction.

Market participants await new inflation data to be released before the Fed meeting mid-September. Recent swings in rate expectations show how sensitive markets are to each new piece of information. The S&P 500 closed on September 4 at 7,713 points with a decline of 0.42 percent, while the Nasdaq Composite fell 0.29 percent.