Background
The Consumer Price Index (CPI) excluding food and energy, commonly known as Core CPI, is a key gauge of underlying inflation trends in the U.S. economy. The monthly change in Core CPI for September 2026 will be officially reported by the Bureau of Labor Statistics (BLS) on October 14, 2026. This figure is closely watched by policymakers, investors, and economists because it strips out volatile food and energy prices, providing a clearer picture of persistent inflation pressures.
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Inflation dynamics remain a central concern amid ongoing monetary policy adjustments by the Federal Reserve. After a period of elevated inflation earlier in the year, recent months have shown signs of moderation, but uncertainty persists about the pace of disinflation. The September reading will offer fresh insight into whether inflation is continuing to ease or if underlying price pressures are re-accelerating. This makes the upcoming Core CPI release a critical data point for assessing the economic outlook and potential Fed actions.
Candidate Analysis
Looking at recent developments, the 0.2% month-over-month increase in Core CPI appears to be the most plausible outcome. First, the August 2026 Core CPI rose by 0.2%, indicating a steady but moderate inflation pace. Second, recent producer price index (PPI) data for September showed only modest increases in input costs, suggesting limited pass-through to consumer prices. Third, retail sales and consumer spending data from early September pointed to restrained demand growth, which typically tempers inflation. Finally, wage growth reports have indicated a slowdown in nominal wage increases, reducing upward pressure on core inflation.
In contrast, the 0.3% candidate, while close, seems less supported by the latest facts. The absence of significant cost shocks or demand surges in September makes a higher monthly increase less likely. Meanwhile, the 0.1% candidate underestimates the persistent inflationary momentum seen in recent months and does not align well with steady wage and price trends. What remains uncertain is the impact of any late-month supply disruptions or unexpected shifts in service sector prices, which could nudge the figure slightly higher or lower.
Market Signals
Market indicators assign the highest probability to a 0.2% Core CPI increase, followed by 0.3%, with probabilities around 35% and 31% respectively. Trading volumes are highest for these two outcomes, reflecting concentrated attention and liquidity. Price movements over the past day show a slight increase in confidence for the 0.2% scenario, while the 0.3% candidate has seen modest gains as well. Lower probabilities and volumes for other candidates suggest limited market conviction in more extreme inflation moves.
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Our Verdict
The 0.2% Core CPI MoM increase for September 2026 stands out as the most supported scenario based on recent economic data. The steady August reading, combined with moderate input cost changes and restrained consumer demand, points to a continuation of moderate inflation rather than acceleration or sharp deceleration. Wage growth trends further reinforce this view, as slower nominal wage increases tend to dampen core inflation pressures.
Confidence in this outcome is medium because while the data trends are consistent, inflation remains sensitive to unexpected supply chain issues or shifts in service prices late in the month. Key triggers that could alter this assessment include any surprise announcements on energy or housing costs, unexpected shifts in Federal Reserve communications signaling a change in policy stance, or new labor market data indicating a sudden wage acceleration. Monitoring these factors closely in the days leading up to the release will be crucial.
In summary, the evidence leans toward a 0.2% Core CPI increase, reflecting a moderate but persistent inflation environment. This aligns with the broader narrative of gradual disinflation without abrupt price shocks, providing a nuanced view of the inflation trajectory as the year progresses.
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