Will the rate of CPI inflation be above 3.6% for the year ending in September 2026?

- [2026-09-11] BLS reported August 2026 CPI-U rose 3.4% year-over-year (unadjusted), unchanged from July, with core CPI (ex food/energy) up 2.4% y/y; monthly headline gained 0.4% (seasonally adjusted), largely on a 3.9% jump in gasoline. The Consumer Price Index for All Urban Consumers (CPI-U) increased 3.4 percent over the last 12 months to an index level of 334.980 (1982-84=100). For the month, the index rose 0.3 percent prior to seasonal adjustment. Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] Energy was the dominant driver: the Consumer Price Index for All Urban Consumers (CPI-U) increased 3.4 percent over the last 12 months while the BLS release detail shows the energy index up 16.3% y/y and gasoline up 27.4% y/y, tied to Middle East (Iran war) supply disruptions per CNBC's coverage citing economists. Source: https://www.cnbc.com/2026/09/11/cpi-inflation-breakdown-august-2026.html - [2026-09-16] The Federal Reserve raised its benchmark rate 25bp (to roughly 3.75%-4.00%) at its September meeting, its first hike since 2023, explicitly responding to stubborn/upside inflation risks flagged after the August CPI print. Source: https://polymarket.com/event/how-high-will-inflation-get-in-2026 - [2026-09-20] Nowflation's own model forecasts September 2026 headline CPI (to be released Oct 14) at 3.53% y/y, while the "Street" consensus tracked on the same page is materially higher at 3.7% y/y — both bracketing the 3.6% threshold from opposite sides. Source: https://nowflation.com/forecast - [2026-09-20] The same tracker's historical accuracy note shows consensus has matched the actual print exactly only 11 of the last 27 times Of the last 27 headline CPI prints on this page, the Street consensus matched the print exactly 11 times (within 0.05 percentage points). — underscoring real uncertainty around whether September lands above or below 3.6%. Source: https://nowflation.com/cpi-release-dates - [~2026-09-08] The Cleveland Fed's nowcasting model (cited by a Yahoo Finance/Motley Fool piece) projected CPI easing to about 3.38% in August and roughly 3.3% for September 2026 — a materially cooler path than the 3.7% Street consensus and below the 3.6% resolution bar. In June and July, TTM inflation dipped to 3.5% and 3.4%, respectively. According to the Cleveland Fed's latest update, the CPI is estimated to ease to 3.38% in August and 3.3% in September. Source: https://finance.yahoo.com/economy/policy/articles/federal-reserves-initial-september-inflation-082600336.html - [2026-09-11] The August print exactly matched the 3.4% consensus, and prior months show mixed surprises (June: actual 3.5% vs 3.8% consensus; May: actual 4.2% matched consensus; April: actual 3.8% vs 3.7% consensus) — indicating volatile, energy-driven swings earlier in 2026 before stabilizing at 3.4% for July/August. Source: https://nowflation.com/cpi-release-dates - [2026-09-21 (schedule as of today)] The September 2026 CPI report — the figure that will determine this market's outcome — is scheduled for release by BLS on October 14, 2026 at 8:30 a.m. ET, two days after this Kalshi market's stated trading close. The Consumer Price Index news release for September 2026 is scheduled to be published on Wednesday, October 14, 2026, at 8:30 a.m. Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-20] A related Kalshi-tracking model (Octagon) noted thin-market pricing dynamics around CPI threshold contracts in September, with a sharp, unexplained repricing on August 22, 2026, suggesting elevated uncertainty/volatility in how traders are pricing the September CPI outcome. Source: https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-09-19] Polymarket's "How high will inflation get in 2026" tracker notes energy prices (+16.3% y/y as of August) and geopolitical supply pressures as the key upside risk still in play heading into the September and October CPI reports. Recent CPI data show U.S. inflation at 3.4% year-over-year in August 2026 after reaching 4.2% in May, with energy prices rising 16.3% over the year and contributing to upside risks. Source: https://polymarket.com/event/how-high-will-inflation-get-in-2026 BOTTOM LINE: The most recent hard data point (August 2026, released Sept 11) puts y/y CPI at 3.4%, below the 3.6% threshold, but professional forecasters are split for September — Nowflation's model (3.53%) and the Cleveland Fed nowcast (~3.3%) sit below 3.6%, while the Street consensus (3.7%) sits above it, with energy/gasoline shocks the main upside wildcard; the deciding September CPI print arrives Oct 14, 2026, after this market's stated close, so as of today the outcome is unresolved and genuinely close to the threshold. NOT FOUND: No official BLS "advance" or leaked figure for the September 2026 CPI exists yet (report not due until Oct 14, 2026); could not find a single authoritative, unanimous consensus number for September CPI (sources diverge between 3.53% and 3.7%).

- [2026-09-11] The BLS reported headline CPI-U rose 3.4% year-over-year for the 12 months ending August 2026, unchanged from July's 3.4%, matching the consensus forecast; core CPI eased to 2.4% y/y. The Consumer Price Index for All Urban Consumers (CPI-U) increased 0.4 percent on a seasonally adjusted basis in August after rising 0.1 percent in July... Over the last 12 months, the all items index increased 3.4 percent before seasonal adjustment. Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-20] Base-rate track record from the last 27 headline CPI prints: the Street consensus matched the print exactly 11 times (within 0.05 percentage points) , i.e. roughly 40% exact-match rate, with the rest of the time missing in either direction by small margins — useful for gauging typical forecast error size (usually ≤0.1–0.2pp) ahead of the September 2026 print. Source: https://nowflation.com/cpi-release-dates - [2026-09-20] Recent trailing prints show the y/y rate hovering just under the 3.6% threshold: June 2026 3.5%, July 2026 3.4%, August 2026 3.4% — a run of three consecutive months below 3.6%, which is the immediate reference trend the question must beat. Source: https://nowflation.com/cpi-release-dates - [2026-09-20] Despite that recent softness, the "Street" consensus tracked by Nowflation for the September 2026 print (due Oct 14, 2026) is 3.7% — i.e. professional/market consensus currently expects the rate to be reported *above* the 3.6% threshold, while Nowflation's own model forecast is lower, at 3.53%. Source: https://nowflation.com/cpi-release-dates - [2026-08-23] An independent forecasting/market tracker (Octagon) noted professional forecasters anticipate 2026 headline and core CPI inflation to average 3.5% and 2.9% respectively on a Q4/Q4 basis , consistent with a headline rate near, but not decisively above, 3.6% by September. Source: https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-Q2] The Philadelphia Fed Survey of Professional Forecasters (a well-established, decades-long consensus panel) put headline CPI and core CPI inflation in 2026 are expected to average 3.5 percent and 2.9 percent on a Q4/Q4 basis, again clustering just below the 3.6% bar rather than clearly above it. Source: https://www.philadelphiafed.org/surveys-and-data/real-time-data-research/spf-q2-2026 - [2026-09-04] A separate macro-odds tracker noted energy/gasoline effects are the swing factor: An energy shock, with gasoline up 24.6% year over year, is driving headline inflation well above target while the labour market stays firm at 4.1% unemployment. This underlines that base-rate CPI momentum is being pushed upward mainly by volatile energy prices, not core trend. Source: https://macroodds.com/blog/fed-rate-hike-odds-september-2026 - [2026-09-18 (approx, "3 days ago")] The directly relevant Kalshi contract "Above 3.6%" for CPI YoY in September 2026 is currently trading close to a coin-flip: Above 3.6% ▼ 41 · Yes 53¢No 56¢ — implying the market itself sees roughly 50-55% probability of resolving Yes, with an adjacent "Above 3.7%" contract priced much lower (Yes ~24¢), showing the market's implied distribution is centered right around 3.5–3.6%. Source: https://kalshi.com/markets/kxcpiyoy/inflation/kxcpiyoy-26sep - [2026-08-22] An AI-panel/market comparison site observed that for the August CPI print, Every seat and the market agree the number lands around 3.4 , and separately that the panel assigns very low probability (about 4%) to prints of 3.7% or higher for that reference month, illustrating how tightly clustered both model and market forecasts have been around the mid-3% range in 2026. Source: https://www.oddsshopper.com/articles/prediction-markets/cpi-report-odds-model-verdict - [2026-09-11 update] The Cleveland Fed's real-time inflation nowcast, cited via a secondary source, had projected the rate to actually ease slightly toward September: the Cleveland Fed's latest update, the CPI is estimated to ease to 3.38% in August and 3.3% in September — a nowcast that, if realized, would round to 3.3% and resolve No, in tension with the higher Street consensus (3.7%) and Kalshi's near-50/50 pricing. Source: https://finance.yahoo.com/economy/policy/articles/federal-reserves-initial-september-inflation-082600336.html BOTTOM LINE: The base-rate/outside-view picture is genuinely split: the last three reported y/y prints (3.5%, 3.4%, 3.4%) sit below 3.6%, professional-forecaster panels (SPF, Octagon-tracked consensus) put 2026 headline CPI averaging ~3.5% Q4/Q4, and a Fed nowcast even pointed toward ~3.3% for September — all arguing for No. But the live prediction market itself (Kalshi's own "Above 3.6%" contract) is pricing close to a coin-flip (~53-56¢), and the Street "consensus" figure tracked ahead of the October 14 release sits at 3.7% (above threshold), reflecting upside risk from persistent gasoline/energy price increases. On balance, historical base rates and forecaster surveys lean slightly toward No/borderline, while the market-implied probability is essentially even. NOT FOUND: A definitive, single verified "current" Kalshi mid-price or Polymarket probability with a precise timestamp close to today's date (2026-09-21); only a snapshot dated a few days prior was available. Could not find a formal historical base rate (e.g., % of months in the last 20 years) where y/y CPI exceeded a similarly-defined threshold, nor a direct BLS September 2026 print (not yet released as of this report, due October 14, 2026).

- [2026-09-11] The BLS reported that over the last 12 months, the all items index increased 3.4 percent before seasonal adjustment for August 2026, with consumer inflation picking up in August as gas prices surged even as the headline annual rate held steady. Source: https://www.bls.gov/news.release/cpi.htm - [2026-09-20] Nowflation's tracker, current as of data through Sept 20, 2026, states plainly: "The CPI for September 2026 is released October 14, 2026 at 8:30 AM ET — consensus 3.7%, Nowflation forecast 3.53%" — i.e., the Street consensus itself sits above the 3.6% threshold. Source: https://nowflation.com/cpi-release-dates - [2026-09-11] Energy is the key upside driver: for the August 2026 report, the index for gasoline rose 3.9 percent in August, accounting for over one third of the monthly all items increase . Source: https://www.bls.gov/news.release/cpi.htm - [2026-09-11] On a year-over-year basis, gasoline prices rose 27.4% yoy, slightly more than 24.6% in July and fuel oil prices increased 52%, compared with 39.1% previously , showing accelerating energy-driven inflation pressure that could persist or intensify into September. Source: https://tradingeconomics.com/united-states/inflation-cpi - [2026-09-15] Independent econometric forecasting service Long Forecast projects the September 2026 CPI print at "3.360%" with a possible range up to "3.562%" — near but just under 3.6%, underscoring how close the actual outcome may be to the threshold. Source: https://longforecast.com/us-cpi - [2026-08-23] A market-research summary notes the Fed's Q2 2026 Survey of Professional Forecasters expecting Q4/Q4 headline CPI at 3.50%, with concerns that inflation may persist due to tariff pressures, fiscal policy, and labor market conditions , and separately that energy prices, particularly gasoline, are highly sensitive to Middle East geopolitical tensions, meaning risks of a reversal and secondary inflationary impacts persist for the September print . Source: https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-08-07] The NY Fed's Survey of Consumer Expectations showed Q2 2026 Survey of Professional Forecasters expecting Q4/Q4 headline CPI at 3.50% , and median one-year-ahead household inflation expectations at 3.6% as of July 2026 — right at the strike, indicating the public and markets see meaningful odds of a 3.6%+ print. (Per Octagon summary of NY Fed data.) Source: https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-09-11] Earlier in 2026, headline YoY CPI already spiked well above the current threshold — reaching 3.8% in April and 4.2% in May 2026 before easing to 3.5% (June) and 3.4% (July/August) — demonstrating the series has recent precedent for volatility that could push a single print back above 3.6% given tariff pass-through or an energy shock. Source: https://nowflation.com/cpi-release-dates - [2026-09-11] The finance calendar's tracker likewise flags that the most recent confirmed reading was 3.8% year-over-year for April 2026, the highest annual inflation rate since May 2023, driven by energy prices rising 17.9% on an annual basis , reinforcing that tariff- and energy-driven spikes above 3.6% have occurred within the trailing 12 months and could recur. Source: https://www.financecalendar.com/event/us-cpi-report-september-2026/ BOTTOM LINE: The single most plausible path to YES is a Street-consensus-consistent September print near 3.7% YoY, driven by continued gasoline/energy price surges (up 27%+ YoY) and tariff pass-through, which would exceed the 3.6% threshold; this is a live scenario since consensus (per Nowflation) is already above the strike and headline CPI has printed as high as 4.2% earlier in 2026, showing the series' capacity for upside surprises even as core inflation cools. NOT FOUND: No official BLS or Fed "nowcast" specifically for September 2026 CPI (Cleveland Fed's public nowcast only covered August 2026 at time of search); no confirmed Wall Street consensus figure from a primary source (e.g., Bloomberg/Reuters survey) independent of the Nowflation aggregator.

- [2026-09-11] The August 2026 CPI report — the last hard data point before the September figure — showed headline CPI at the Consumer Price Index for All Urban Consumers (CPI-U) increased 3.4 percent over the last 12 months to an index level of 334.980 (1982-84=100) , 0.2pp below the 3.6% threshold. Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] Core inflation (ex food/energy) is decelerating, not accelerating: core inflation rose 2.4% over the 12 months through August — the lowest core inflation rate since March 2021 — in line with expectations and down from 2.5% in July . This underlying disinflation trend argues against a jump to >3.6% headline. Source: https://www.usinflationcalculator.com/inflation/us-cpi-august-2026/100073342/ - [2026-09-20] Nowflation's own statistical model — built on real-time data — forecasts September 2026 CPI YoY at 3.53%, below the 3.6% strike, even though it flags a Street "consensus" of 3.7% (per its own disclosed meta-description: "The CPI for September 2026 is released October 14, 2026 at 8:30 AM ET — consensus 3.7%, Nowflation forecast 3.53%"). Source: https://nowflation.com/cpi-release-dates - [2026-09-15] Professional forecasters in the CNBC Fed Survey, while raising estimates, still put the average CPI forecast rose to near 3.5% for this year and 2.85% for 2027 — under the 3.6% bar. Source: https://www.cnbc.com/2026/09/15/cnbc-fed-survey-two-rate-hikes-seen-ahead.html - [2026-09-15] Longforecast's model-based projection for September 2026 puts CPI at roughly 3.36%, well under the threshold, with a "maximum" scenario of only 3.562% — still short of 3.6%. Source: https://longforecast.com/us-cpi - [2026-09-18] The live Kalshi market for this exact contract ("Above 3.6%") is priced close to a coin-flip (Yes 53¢ / No 56¢ bid-ask), not showing strong conviction that inflation will exceed 3.6%; the adjacent "Above 3.7%" contract trades far lower (Yes 24¢), implying the market sees the most likely outcomes clustering in the 3.4%-3.6% band. Source: https://kalshi.com/markets/kxcpiyoy/inflation/kxcpiyoy-26sep - [2026-09-14] FactSet's own median estimate track record shows forecasters have historically run too hot relative to actual prints: over the past 12 months, the increase in the CPI has surpassed the median estimate in 1 month, matched the median estimate in 4 months, and fallen short of the median estimate in 7 months , a pattern favoring downside surprises relative to consensus. Source: https://insight.factset.com/consumer-price-index-cpi-for-august-2026-is-projected-to-rise-3.3-year-over-year - [2026-09-11] Month-over-month momentum has been volatile rather than steadily accelerating: the CPI-U increased 0.4 percent on a seasonally adjusted basis in August after rising 0.1 percent in July , following a -0.4% decline in June — a choppy, non-monotonic pattern that has repeatedly failed to sustain acceleration long enough to break through higher YoY bands. - [2026-09-16] The Fed's own policy response — a 25bp hike on September 16, 2026, the first since 2023 — is explicitly aimed at arresting further inflation acceleration, per "Chair Warsh and others signaled that interest rates can remain on hold only if disinflation continues," and Nationwide "now expects a quarter-point hike" , which was delivered; tightening reduces the odds of a further inflation breakout on the margin. Source: https://www.cnbc.com/2026/09/11/cpi-inflation-report-august-2026.html - [2026-09-11] Even the biggest recent upside driver — energy — is a volatile, potentially reversible input: the oil supply shock has raised prices for gasoline, diesel, jet fuel and other fuels refined from crude oil... gasoline prices were up nearly 4% in the month of August and more than 27% from August 2025 , meaning a stabilization or partial reversal of oil/gasoline prices in September could hold headline CPI below 3.6% given base effects will start rolling off the extreme spring 2026 volatility. BOTTOM LINE: The most recent hard data (August 2026: 3.4% YoY, core cooling to 2.4%), the closest-tracking nowcasting models (Nowflation 3.53%), Wall Street's average forecast (~3.5%), and the live Kalshi market price itself (near 50/50 on "Above 3.6%") all cluster below or right at the 3.6% strike, giving the NO case a real evidentiary basis, contingent on gasoline/energy prices not reaccelerating sharply in September. NOT FOUND: No official BLS or Dow Jones/Reuters consensus specifically for the September 2026 CPI print was located (BLS release is not until October 14, 2026); could not confirm a single authoritative "Street consensus" figure distinct from Nowflation's own model, so the 3.7% figure cited by some secondary sites is unverified against a primary survey.