October Fed Rate Hike Odds Surge to 43% as U.S. CPI Inflation Hits 3.7%

TLDR:

• Polymarket’s October rate hike odds rose about 25 percentage points to 43%, while unchanged rates held 57%.
• U.S. CPI inflation climbed to 3.7% in September, exceeding the 3.6% forecast and August’s 3.4% reading.
• Core CPI gained 0.3% monthly and 2.6% annually, both exceeding forecasts of 0.2% and 2.5%, respectively.
• September PPI arrives October 15; the October 27–28 Fed decision comes before September PCE on October 29.

An inflation miss of just 0.1 percentage point triggered a much larger market repricing on October 14, lifting October rate-hike odds to 43%. September’s consumer price report delivered the catalyst, with annual U.S. CPI inflation reaching 3.7% against a 3.6% forecast. That comparison became a focal point for markets assessing whether inflation progress had stalled before the interest rate decision.

On Polymarket, the probability of a 25-basis-point increase climbed approximately 25 percentage points during Wednesday’s trading. However, unchanged rates retained a 57% probability ahead of the October 27–28 policy meeting. The figures captured a rapid shift in expectations without making another increase the favored outcome.

The report also showed core inflation running above forecasts, placing attention on price pressures beyond gasoline. The difference matters as energy-driven increases and broader inflation carry distinct implications for the central bank’s 2% inflation objective.

September CPI Hits 3.7% as Core Inflation Exceeds Forecasts

Headline prices increased 0.6% in September, accelerating from August’s 0.4% monthly gain. Similarly, gasoline costs jumped 9.1% and accounted for more than half the increase. Meanwhile, the broader energy index climbed 5.2%, explaining much of the immediate pressure on household budgets. That left other categories contributing to a report dominated, but not defined, by energy.

Yet the increase extended into other spending categories. Shelter prices rose 0.4%, alongside higher prices for used vehicles, airline fares, medical care, and apparel. Those movements showed that inflation was not confined to fuel. These increases showed price pressure outside energy, an important distinction when interpreting the core inflation figures.

Core consumer prices, excluding food and energy, advanced 0.3% monthly, above the expected 0.2%. Annual core inflation reached 2.6%, compared with forecasts of 2.5% and August’s 2.4%. Both annual inflation readings remained above the central bank’s target.

CME Hike Odds Reach 43.7% Ahead of PPI and October Meeting

The Fed had already increased its benchmark rate by 25 basis points to 3.75%–4.00% on September 16. Meeting minutes showed most policymakers considered another increase appropriate before year-end, while keeping decisions dependent on incoming economic data.

The shift was visible beyond Polymarket. CME FedWatch put the likelihood of an October increase at 43.7%, up from 22.1% before the inflation release. That represented a 21.6-percentage-point increase in expectations. Two-year Treasury yields climbed, the dollar strengthened, and U.S. equities declined as financial markets reacted.

Higher borrowing costs also affect liquidity conditions surrounding Bitcoin and Ethereum, although the inflation report provided no cryptocurrency price figures. Attention now turns to September’s Producer Price Index on October 15. September Personal Consumption Expenditures data are also scheduled for October 29, one day after the policy meeting concludes. For now, unchanged rates remain the leading October outcome.

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