# September CPI rose 0.6% as Core CPI increased 0.2%

*Economics. 37% certain. Thursday, 15 October 2026*

> Speculative fiction assembled from prediction-market prices. This has not happened.

**Annual inflation hit 3.6% in September, confirming modest Core price growth.**

September 2026 consumer price data showed a 0.6% rise in the headline CPI over the month. The annual inflation rate measured by the CPI stood at 3.6%. Core CPI, which excludes food and energy, increased by 0.2% month-over-month. That gain was above the 0.1% level recorded in the prior day's preliminary reading.

The headline and Core CPI figures were released on Thursday, 15 October. The Core CPI month-over-month reading of 0.2% settled that day. A day earlier, on Wednesday, 14 October, the Core CPI had been confirmed to exceed the 0.1% threshold. Both releases completed the September inflation report.

Core inflation, stripped of those items, continued its modest pace.

At an annualised rate, the CPI's 3.6% pace remained above the Federal Reserve's longer-term target. The figure incorporated the monthly gains reported for September. It signaled that price pressures persisted across the year.

The headline CPI was posted at a 0.6% month-over-month increase. Core CPI was logged at a 0.2% rise, confirming it was above 0.1%. The annual CPI rate was set at 3.6%.

## Analysis

The 0.6% month-over-month rise in the headline CPI indicates that price pressures remain elevated, especially in categories that are not excluded from the Core measure. Because the headline figure incorporates food and energy, its larger jump suggests those volatile components are contributing to the overall inflation pace, which policymakers monitor closely when assessing the need for monetary adjustments.

Core CPI's modest 0.2% increase, while above the 0.1% threshold, shows that underlying inflation is not cooling rapidly. That level of Core price growth limits the room for aggressive policy easing, as the Federal Reserve typically looks for a more pronounced slowdown in Core inflation before cutting rates. The data therefore keep the prospect of immediate rate reductions uncertain.

An annual CPI rate of 3.6% remains above the central bank's longer-term target, implying that inflationary pressures have persisted over the year. This sustained pace may compel the Fed to maintain a restrictive stance for longer, but the exact trajectory of future readings remains unclear.

### Background consulted for the analysis

- [Inflation Nowcasting](https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting)
- [September CPI is just the tip of the inflation iceberg - RBC Economics](https://www.rbc.com/en/economics/us-week-ahead/september-cpi-is-just-the-tip-of-the-inflation-iceberg/)
- [US CPI September 2026: Forecast, Core CPI and Fed Odds](https://admiralmarkets.com/analytics/traders-blog/us-cpi-preview-september-2026-forecasts-and-the-core-cpi-outlook)
- [United States Core Inflation Rate](https://tradingeconomics.com/united-states/core-inflation-rate)

## What this was built from

- **September Inflation US - Annual**: 3.6%, 44%; settles Thursday, 15 October 2026 (polymarket). [Market](https://polymarket.com/event/september-inflation-us-annual)
- **September Inflation US - Monthly**: 0.6%, 41%; settles Thursday, 15 October 2026 (polymarket). [Market](https://polymarket.com/event/september-inflation-us-monthly)
- **US headline inflation rate in September (month-over-month CPI)**: Above 0.4%, 62%; settles Wednesday, 14 October 2026 (futuur). [Market](https://futuur.com/q/247563/us-headline-inflation-rate-in-september-month-over-month-cpi)
- **Core CPI YoY - September 2026**: 2.5%, 37%; settles Thursday, 15 October 2026 (polymarket). [Market](https://polymarket.com/event/core-cpi-yoy-september-2026)
- **Core CPI MoM - September 2026**: 0.2%, 45%; settles Thursday, 15 October 2026 (polymarket). [Market](https://polymarket.com/event/core-cpi-mom-september-2026)
- **US Core CPI inflation (month-over-month): September**: Above 0.1%, 64%; settles Wednesday, 14 October 2026 (futuur). [Market](https://futuur.com/q/247562/us-core-cpi-inflation-month-over-month-september)