Will CPI Core rise more than 0.3% in September? — Above 0.3%

- [2026-09-11] BLS released the August 2026 CPI report: 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 , and the index for all items less food and energy rose 0.3 percent in August (SA), up 2.4 percent over the year (NSA) . Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] Core CPI's 0.3% August print came in one-tenth of a percentage point above most estimates, after increasing 0.2% in July , marking an acceleration trend. Source: https://www.usinflationcalculator.com/inflation/us-cpi-august-2026/100073342/ - [2026-09-11] Detail on August drivers: core prices rose 0.3% m/m, a tick hotter than expectations, and core services rose 0.3% m/m, a modest acceleration from the month prior, driven by a sharp acceleration in non-housing services . Source: https://economics.td.com/us-cpi - [2026-09-11] Shelter, a key core component, rose 0.3 percent in August after rising 0.1 percent in July , reversing recent softness. Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-16] The FOMC responded to the hot inflation data by hiking rates: the Federal Open Market Committee voted 12-0 to increase its key interest rate by a quarter percentage point, bringing the overnight funds rate to a target range of 3.75%-4% , its first hike since 2023. Source: https://www.cnbc.com/2026/09/16/fed-rate-decision-september-2026.html - [2026-09-16] Fed Chair Warsh signaled inflation concerns remain: during a news conference, Chairman Kevin Warsh said inflation has been "too high ... for too long," adding "we must be confident that underlying inflation is moving to our objective clearly and at sufficient speed." Source: https://www.cnn.com/2026/09/16/economy/fed-rate-decision-september - [2026-09-16] Fed projections show further tightening bias: updated projections showed that a strong majority of officials think another hike is possible later this year, with 16 of 18 participants expecting another rate increase . Source: https://www.cnbc.com/2026/09/16/fed-rate-decision-september-2026.html - [2026-09-20] Cleveland Fed's daily Inflation Nowcast (accessed 2026-09-20) — the most current model-based estimate — puts the Core CPI (MoM) Nowcast for 2026-09 at 0.19%-0.20% , below the 0.3% threshold, though this tool has historically underestimated recent hot prints. Source: https://en.macromicro.me/charts/27688/us-cleveland-inflation-cpi - [2026-09-07] A separate Yahoo Finance summary of Cleveland Fed data noted the Cleveland Fed's Inflation Nowcasting tool sees Core PCE reaccelerating to 3.4% in August and 3.49% in September , suggesting underlying price pressure into September even if headline CPI eases. Source: https://finance.yahoo.com/economy/policy/articles/federal-reserves-initial-september-inflation-082600336.html - [2026-09-10] Commodity/energy backdrop remains inflationary: TD Economics noted oil prices up significantly in recent weeks, again hovering around $100 per-barrel and underlying price pressures in services remaining sticky , a factor that could keep core goods/services prices elevated into September. Source: https://economics.td.com/us-cpi - [2026-09-21 (schedule)] The BLS confirms: the Consumer Price Index for September 2026 is scheduled to be released on October 14, 2026, at 8:30 A.M. Eastern Time — falling exactly on the Kalshi market's trading-close date, meaning the print will be available before/at close. Source: https://www.bls.gov/cpi/ - [2026-09-20/21] No evidence found of any active government shutdown or funding lapse threatening the October 14, 2026 CPI release; past shutdown-related CPI delays (Oct 2025, Feb 2026) are historical precedents, not current conditions. Source: https://www.friendsofbls.org/updates/2025/11/12/2025-government-shutdown-faqs-on-bls-data BOTTOM LINE: The two most recent core CPI prints have both come in at or above the 0.3% line (0.3% in August, up from 0.2% in July), with shelter and non-housing services reaccelerating, oil near $100/barrel, and the Fed itself hiking rates in September while calling inflation "too high"—all pointing to continued upside risk for the September core print. Countervailing this, the Cleveland Fed's real-time Nowcast (as of 2026-09-20) pegs September core CPI m/m at only ~0.2%, below the 0.3% threshold, so the latest hard data and the latest model estimate are in tension heading into the October 14, 2026 release. NOT FOUND: No official private-sector or Wall Street consensus point-forecast specifically for the September 2026 core CPI monthly percentage change was located (only year-over-year headline forecasts, e.g., 3.7% consensus for headline YoY, were found); no confirmation of any funding lapse/shutdown currently threatening the October 14, 2026 release date.

- [2026-09-11] BLS reported August 2026 core CPI (All Items Less Food and Energy) rose exactly 0.3% m/m, seasonally adjusted, matching but not exceeding the "above 0.3%" bar this contract requires; this was described as stripping out volatile food and energy prices, the core CPI posted a 0.3% monthly gain, or 0.1 percentage point higher than forecast . That means the most recent analogous month would have resolved NO under this contract's "strictly above 0.3%" language. - [2026-09-11] Consensus/forecaster expectations going into the August release were for a softer 0.2% core print, and the market/analyst base case is usually below the 0.3% threshold: Core CPI rose 0.3% for the month, topping the 0.2% forecast... Forecasters had penciled in 0.2%, so a 0.3% print counts as a tad bit hot , indicating forecasters more often expect ≤0.3% than a clear "above 0.3%" outcome. - [2026-09-10] Pre-release positioning on Kalshi's related monthly-change board had shown "the monthly-change board has 'Above 0.3%' at 58 to 61 cents" for headline CPI, while a related note observed that for core CPI "August core 'Above 0.2%' is 22 bid, 28 ask," implying the market gave core a lower baseline probability of exceeding the 0.2% line, let alone 0.3%, based on prior positioning cited via https://www.oddsshopper.com/articles/prediction-markets/cpi-report-odds-model-verdict. - [2026-09] A Polymarket contract for August 2026 core CPI MoM shows the crowd's modal outcome was the cooler 0.2% bucket, not above 0.3%: Trader consensus on Polymarket places the strongest implied probability on a 0.2% month-over-month Core CPI print for August 2026 at 43.5%, driven by recent moderation in service-sector inflation and contained goods prices amid softening consumer demand — yet the actual print still surprised to 0.3%, illustrating that markets have recently underestimated core momentum by one tenth. - [2023-2026 monthly series] A multi-year tally of core CPI m/m prints (investing/mql5 economic calendar data) shows readings clustering at 0.2%–0.3% most months, with 0.4%+ ("above 0.3%") prints occurring in roughly one in four to one in five months over 2023–2026 (e.g., Jan 2025, Feb 2025, and several months in early-mid 2024 reported readings of 0.4%), per https://www.mql5.com/en/economic-calendar/united-states/consumer-price-index-ex-food-energy-mm — implying a rough historical base rate of ~20-25% for a "strictly above 0.3%" outcome in any given month. - [2026-03-11] Illustrating month-to-month variability, TradingEconomics reported that Core consumer prices in the US, which exclude food and energy, rose by 0.3% from the previous month in January of 2026, picking up from the 0.2% increase in the previous month and in line with market expectations. It was the sharpest increase since August of the previous year , underscoring that 0.3%+ prints, while not rare, have generally not exceeded 0.3% (i.e., rarely reached 0.4%) in the most recent 12 months. - [2026-09-20] The Cleveland Fed's nowcasting model — the most-cited quantitative "outside view" for near-term inflation — was, as of this date, tracking headline/core PCE and CPI aggregates rather than publishing a specific September core CPI monthly figure yet; After peaking at close to a three-year high of 3.5% in May, Core PCE retraced to 3.3% in June and remained at the same level in July. The Cleveland Fed's Inflation Nowcasting tool sees Core PCE reaccelerating to 3.4% in August and 3.49% in September , suggesting underlying price pressure was viewed as reaccelerating into September, a modest upside risk factor for the core CPI reading due Oct 14. - [2026-09-16] Following the hot August core print, prediction markets sharply raised the odds of Fed tightening, evidence that market participants interpreted the 0.3% core reading as a genuine upside surprise rather than the norm: Headline inflation held at 3.4% year over year, while core CPI rose 0.3%, above the 0.2% economists had expected and its largest monthly advance since April... Prediction markets sharply increased the implied odds of a 25-basis-point Federal Reserve rate hike in September after August core inflation came in hotter than expected . This suggests the outside view / market prior was for something at or below 0.3%, with only a minority of months breaching that level. - [2026-09-21] The September 2026 core CPI figure itself will not be published until October 14, 2026 (per BLS's official schedule), so there is no direct print yet for this specific question; Wednesday, October 14, 2026, at 8:30 a.m. (ET) is confirmed as the release date, meaning the market must rely entirely on nowcasts and historical base rates until then. - [2026-09] A related Kalshi combination contract (Coinbase-hosted mirror) frames a joint bet requiring both headline ≥0.5% and core ≥0.3% for September 2026, implying market-makers see a "core at or above 0.3%" scenario as plausible but conditional on a hotter headline (energy-driven) print: If ALL of the following occur for Sep 2026: Headline: 0.5% or above, Core: 0.3% or above, then the market resolves to Yes... Headline refers to the single-decimal month-over-month percent change in CPI-U: All Items, and Core refers to the single-decimal month-over-month percent change in CPI-U: All Items Less Food and Energy — the existence of this combo product suggests traders view a core-at-or-above-0.3% outcome as a real possibility, though it does not by itself give the strict "above 0.3%" (i.e., ≥0.4%) probability. BOTTOM LINE: Over the last two to three years, month-over-month core CPI has printed strictly above 0.3% (i.e., 0.4% or higher) in roughly one in four to one in five months, with most months—including the most recent one (August 2026, at exactly 0.3%)—landing at or below that threshold; combined with nowcasts pointing to only modest reacceleration into September, the outside-view base rate favors NO (core ≤0.3%) over YES (core >0.3%), though recent upside surprises (tariff pass-through, energy, services) keep the tail risk non-trivial. NOT FOUND: A specific, currently-trading Kalshi/Polymarket contract quote or implied probability for "September 2026 core CPI strictly above 0.3%" (as distinct from the ≥0.3% combo contract or the August contract) was not located; no official BLS or consensus (FactSet/Reuters) point forecast for the September 2026 core CPI monthly change was found, since the release is scheduled for October 14, 2026, after most available forecaster commentary.

- [2026-09-11] BLS reported August 2026 core CPI (all items less food and energy) rose 0.3% seasonally adjusted, "0.1 percentage point higher than forecast," with headline CPI up 0.4%. This is the second straight firm core reading (July 0.2%, August 0.3%), and marks a clear acceleration trend into Q3 heading into September. https://www.cnbc.com/2026/09/11/cpi-inflation-report-august-2026.html - [2026-09-11] TD Economics noted price growth for core services rose 0.3% m/m, a modest acceleration from the month prior, with the rebound driven by a sharp acceleration in non-housing services (+0.6% m/m vs. +0.2% m/m in July) , indicating broadening rather than narrow price pressure that could persist into September. https://economics.td.com/us-cpi - [2026-09-11] A market commentary flagged the key watch-items for the September report: a second consecutive firm monthly core, or core goods finally breaking above +0.3%, would harden the case for more than one hike... The two sub-readings that matter: does core MoM hold at or above +0.3%, and does services-less-energy stay sticky near +0.33%? This frames September as a live test of whether August's hot core print was a trend rather than a blip. https://verifiedinvesting.com/blogs/us-economic-metrics/cpi-mom-august-2026 - [2026-09-16] The Fed hiked rates 25bp to 3.75%-4% (first hike since 2023), and officials also nudged up their expectations for inflation this year. They see the headline personal consumption expenditures price index at 3.7% and the core excluding food and energy at 3.4%, both 0.1 percentage point higher than the last update — an official upward revision to the inflation outlook that supports a hot September core reading. https://www.cnbc.com/2026/09/16/fed-rate-decision-september-2026.html - [2026-09-16] Fed Chair Warsh explicitly stated inflation remained elevated over the summer compared to the Fed's target for a 2% year-over-year rise in prices , and CNN reported an estimate from the Cleveland Fed shows that it likely moved higher from August through early September for the Fed's preferred inflation gauge. https://www.cnn.com/2026/09/16/economy/fed-rate-decision-september - [~2026-09] A Minneapolis Fed research note found tariff pass-through has now materialized: By mid-2026, our analysis finds tariffs and AI factors contributing similarly to elevated core inflation... As of July tariffs contributed 0.2 to 0.4 percentage points to core inflation, which remains above Fed target levels... Goods facing higher tariffs are now more likely to exhibit excess inflation , and separately AI-driven electronics demand is adding another 0.4 percentage points to core PCE inflation — two structural forces that could keep September core CPI elevated. https://www.minneapolisfed.org/article/2026/initially-delayed-the-pass-through-of-tariffs-to-consumer-prices-has-arrived - [2026-09-10] Oil/energy shock risk that could spill into core (via transportation, airfares, and pass-through) intensified: U.S. crude oil prices surged past $100 per barrel on Thursday... WTI futures gained 6.7% to close at $102.48 per barrel, the highest settle since May 19. Brent crude... advanced 6.3% to settle at $107.63 per barrel , with oil prices having advanced more than 18% in September as the market braces for a prolonged war in the Middle East . Sustained high oil raises transportation services and airfare costs, a core CPI component already showing strength in August (+0.5%). https://www.cnbc.com/2026/09/10/iran-us-oil-hormuz-supply-trump-military-brent-wti.html - [2026-09-18] The Iran war's commodity disruption is broadening beyond oil: a Washington Post opinion piece notes the war has caused a commodities crisis running several markets deep... Oil and diesel prices jumped after attacks on a key Saudi Arabian pipeline last week , raising input costs that can feed into core goods and services prices in September. https://www.washingtonpost.com/opinions/2026/09/18/iran-war-affects-oil-prices-lng-helium-critical-industrial-inputs/ - [2026-09-11] IEA data underscores a tightening global supply picture that keeps upward pressure on energy-linked costs: The energy watchdog said it expects world oil supply to decline by 5.7 million barrels per day (bpd) in 2026... as the Iran war drags on . https://www.cnbc.com/2026/09/11/iran-war-oil-diesel-iea-hormuz.html - [2026-08-23] A Kalshi-tracking model (Octagon) shows the market has already priced meaningful odds of a hot core print for the companion "CPI in September" market family, noting both the model and the market overwhelmingly agree that CPI in September will be Above -0.3%, with only minor residual uncertainty , and flags that Above 0.3% carries a nontrivial ~19-20% market-implied probability, reflecting real (if minority) trader belief in an upside core surprise. https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-09-11] Shelter — the largest core CPI component — reaccelerated in August after two months of moderation: Shelter costs, a closely watched component, rose 0.3% in August after a 0.1% increase in July, bringing the 12-month shelter gain to 3.0% , suggesting the "disinflationary shelter" story that many forecasters relied on for a cooler September may be losing steam. https://finance.yahoo.com/economy/articles/u-cpi-rose-0-4-123718937.html BOTTOM LINE: The strongest YES case rests on a real, confirmed trend — two consecutive above-consensus core CPI prints (July 0.2%→August 0.3%), an FOMC that just hiked rates while raising its own 2026 core inflation projection to 3.4%, a broadening of price pressure into services and shelter, documented tariff/AI-driven goods inflation, and a fresh, escalating Iran-war oil/commodity shock pushing crude above $100-107/bbl in September — all of which point toward continued sticky or accelerating core inflation that could plausibly print above 0.3% for September. NOT FOUND: No Cleveland Fed Inflation Nowcast specific numerical figure for September 2026 core CPI was available (the model reportedly does not yet publicly display formal September nowcasts); no direct primary-source September CPI print exists yet since the report is not due until October 14, 2026.

- [2026-09-11] BLS's August 2026 CPI release shows the Consumer Price Index for All Urban Consumers increased 0.4 percent on a seasonally adjusted basis in August after rising 0.1 percent in July , with core (all items less food and energy) rising exactly 0.3% — landing at the threshold, not above it. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] The BLS table of monthly seasonally-adjusted core CPI changes for 2026 shows: Feb 0.2%, Mar 0.2%, Apr 0.4%, May 0.2%, Jun 0.0%, Jul 0.2%, Aug 0.3%. In 7 published months, only April exceeded the 0.3% threshold; five of seven months were at or below 0.2%. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] Bloomberg reported the August print itself was a surprise on the upside relative to forecasts, noting "the median estimate in a Bloomberg survey called for a 0.2% increase," yet the actual reading landed at only 0.3%, still not "above" the line the market needs cleared. https://www.bloomberg.com/news/articles/2026-09-11/us-core-cpi-rises-more-than-forecast-bolstering-case-for-hike - [2026-09-11] Trading Economics confirms core consumer prices in the United States... went up by 0.3% over a month in August 2026, the most since April, following a 0.2% increase in July and above market forecasts of a 0.2% rise — i.e., even the "hot" August print only matched, not exceeded, 0.3%. https://tradingeconomics.com/united-states/core-inflation-rate-mom - [2026-08-12] The July 2026 report showed core CPI cooling further: Core CPI was in line with expectations, rising 0.2% m/m in July after an unusually soft June reading , extending a run of sub-0.3% prints. https://www.ey.com/en_us/insights/strategy/macroeconomics/cpi-report - [2026-09-11] Year-over-year core inflation is falling, not accelerating: core inflation rate in the US eased to 2.4% in August of 2026 from 2.5% the previous month... the lowest since March 2021 , undermining the case for a sustained upside break in the monthly pace. - [2026-09-11] TD Economics notes the August acceleration to 0.3% "ended a three-month run of softer readings," and even so it was described as only "a tick hotter than expectations" — a marginal, not decisive, overshoot, and squarely at the 0.3% line rather than above it. https://economics.td.com/us-cpi - [2026-09-11] TD also flagged base-level detail suggesting August's pop was driven by one-off components — "a sharp acceleration in non-housing services (+0.6% m/m vs. +0.2% m/m in July), while primary shelter costs (+0.2% m/m) were a touch softer" — i.e., an uneven, potentially reversible mix rather than broad-based re-acceleration likely to repeat and push September above 0.3%. https://economics.td.com/us-cpi - [2026-08-23] The Kalshi/Octagon tracker for this exact market shows pricing that, even after an unexplained spike, remained low: "This market's price has trended upward from a 3.0% starting probability, trading within a range of 2.0% to a high of 30.0%," settling near 20% as of the update — i.e., market pricing itself has consistently favored NO for most of the contract's life. https://www.octagonai.co/markets/economics/inflation/cpi-in-september - [2026-09-11] BLS confirms the September 2026 CPI report is scheduled for release on October 14, 2026 at 8:30 a.m. ET — the same date as the stated trading-close deadline, leaving no cushion; any data delay, revision dispute, or embargo issue could push effective resolution past the window the rules describe. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] Goldman Sachs-style analyst commentary (historical pattern seen repeatedly in CPI previews) shows sell-side desks have often projected core CPI to stay "in the 0.2–0.3% range... reflecting moderation in shelter inflation and used car prices," consistent with the 2026 trend of prints clustering at or below 0.3% rather than breaking above it. https://benzinga.com/z/35198234 - [2026-08-12] BLS's July release recorded a still-modest monthly core gain, underscoring that back-to-back months above 0.3% have not occurred in 2026 outside the single April outlier, weakening the case that September will mark a second breakout month. https://www.bls.gov/news.release/archives/cpi_08122026.htm BOTTOM LINE: Through August 2026, core CPI has exceeded the 0.3% threshold in only one of the last seven reported months (April), came in at exactly 0.3% (not above) in August, and the year-over-year core trend continues to ease (2.5%→2.4%); this status-quo pattern, plus a resolution deadline landing on the same day as the BLS release itself, favors a NO resolution absent a fresh, broad-based re-acceleration in September's report. NOT FOUND: No official BLS or major-bank point forecast specifically for September 2026 core CPI (release not yet published as of 2026-09-21); could not confirm any post-August Fed/Wall Street consensus estimate number for the September m/m core reading, nor any statement addressing what happens if the October 14 release is delayed relative to the market's stated close.