Updated: 4 days ago
U.S. Macroeconomic Analysis and September 2026 Consumer Price Index Forecast: A Comprehensive Research Report
Editor's Note
This is a living CPI research article updated throughout the month as new inflation-relevant developments emerge. It includes weekly macro and market monitoring and, later in the cycle, incorporates XTech's internal CPI forecast ahead of the official BLS release (typically ~10 days and ~2 days before).
This version (October 5, 2026) covers developments through October 2 and includes XTech's final forecast for September CPI, published nine days before the October 14 BLS release.
What changed in this version: Added XTech's final forecast and the September jobs report; revised the summary, energy, labor and services surveillance sections.
XTech CPI Forecast — September 2026
Second and Final Forecast — published October 5, 2026
Key drivers: Gasoline carries the headline, forecast at +10% seasonally adjusted (+7.4% before adjustment). Core cools from August's +0.3%; the surveillance evidence points to steady rents, softer used-car prices and falling insurance indexes.
Upside risks: Airfares and hotel rates, after a 17% rise in jet fuel and record mid-September room rates; faster pass-through of pipeline costs.
Downside risks: Both rounded calls sit close to the line. Headline +0.463% is 1.3 bp above the point where it would print +0.4%; core +0.18% is 3 bp above +0.1%. CPI gasoline sampling can also diverge from weekly pump-price averages.
Conviction: Gasoline, the main driver, is the model's highest-conviction category (96% correlation).
The forecast lifts annual headline inflation to 3.6% from 3.4% while core holds at 2.4%. Because September seasonal factors expect pump prices to fall, a month in which they rose sharply is amplified in the adjusted data: part of the headline strength is seasonal arithmetic on top of a real price shock. The forecast was published nine days before the release, before consensus was available.
Published four days before the BLS release, XTech's forecast differed from consensus on both core measures and was right on each. Consensus moved core year-over-year to 2.4% before the print, arriving at XTech's figure; it never moved on core month-over-month, where it finished wrong.
XTech's CPI Advanced Forecasting Methodology
XTech's CPI forecasts are produced by a machine learning model trained on historical data, consumer survey data, and bespoke alternative datasets, using a one-step-ahead ("teacher forcing") technique that continuously recalibrates against the most recent actual release.
Two forecasts are published each month: the First Forecast (made available to clients ~20 days before the BLS release, before sell-side consensus forms; headline MoM correlation 87%, MAE 0.001) and the Second and Final Forecast (made available to clients ~5 days before, with more data inputs; correlation 88%, MAE 0.0009).
Both cover headline and core CPI (MoM/YoY); category-level forecasts are also available for Gasoline, Shelter, Food, Transportation, Medical, Used Cars, and others.
Why XTech forecasts outperform consensus
Our empirical study benchmarking XTech CPI forecast against the world's leading economists and consensus polls (Nov 2017 – Sep 2025) found:
Metric | XTech Final | Consensus |
Headline CPI MoM directional accuracy | 81.9% | 75.5% |
Headline CPI MoM hit rate (exact bp) | 48.4% | 32.6% |
Headline CPI MAE | 0.0009 | 0.0010 |
Core CPI MoM directional accuracy | 55.3% | 20.2% |
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September 2026 CPI Surveillance
XTech's final forecast puts September headline CPI at +0.5% and core at +0.2%, lifting annual headline inflation to 3.6% while core holds at 2.4%. Gasoline carries the headline with a 10% seasonally adjusted rise, part of which reflects seasonal factors that expect September prices to fall, while steady rents, softer used-car and insurance prices and a labor market that added just 29,000 jobs keep core contained. The risks for the fourth quarter still tilt upward: pipeline price gauges, freight costs and household inflation expectations have all risen, and they typically reach consumer prices with a lag.
1. Energy and Global Commodities
Gasoline is the dominant force in September's print. Regular gasoline averaged $4.355 per gallon in September in EIA's weekly survey, 7.3% above August's $4.058 and 37.6% above a year earlier. September seasonal factors normally expect gasoline to fall roughly 2% from August, so an increase of this size is amplified after seasonal adjustment. Gasoline carries a weight of about 3.8% in the CPI basket.
The driver was a mid-month escalation in Middle East supply disruptions. Attacks on shipping near the Strait of Hormuz and the temporary shutdown of Saudi Arabia's East–West crude pipeline lifted WTI to a September average of $97.31 per barrel, up 16% from August, while the physical Brent spot price averaged $114. U.S. refining added pressure: utilization fell from 97.8% to 92.5% during the month, and gasoline inventories ended September about 7% below their five-year average. Retail diesel rose 15% to a record monthly average of $6.29, and jet fuel rose 17%, feeding freight costs and airfares.
Relief came late: Saudi exports resumed in the final week and retail prices have begun to ease, which matters more for October. Electricity and utility gas prices remain a minor factor.
2. Trade Policy and Tariffs
Tariff policy was a secondary force in September, with the main new actions targeting Canada. From September 15, a 50% additional duty was extended to furniture, mattresses, lamps and several metal products. From September 29, certain Canadian dairy products, alcoholic beverages and large motorcycles were barred from import. Section 232 drone duties took effect September 3. The U.S. and China recommended tariff relief on $30 billion of goods each, with no implementation date yet. A court challenge to the Section 301 tariffs of 10–12.5% on 60 economies was heard on September 30.
The stronger signal came from import prices measured before duties. BLS data show nonfuel import prices up 5.5% year-on-year in August, the largest increase since May 2022. Prices of goods imported from China rose 1.0% on the month, the largest monthly gain since the series began in 2004. Foreign suppliers are raising prices rather than absorbing duties.
Fed Governor Waller and New York Fed President Williams describe tariff pass-through as largely complete. Surveys disagree: tariffs were cited in about a third of negative comments in ISM's September manufacturing report. For September CPI, the tariff impulse looks modest and concentrated in household furnishings.
3. Labor Market and Wages
The labor market is firm but is not generating wage pressure. August payrolls rose 162,000, with upward revisions of 55,000 to the prior two months, and the unemployment rate held at 4.1%. Average hourly earnings rose 0.3% on the month and 3.1% over the year. That is below 3.4% CPI inflation, so real hourly earnings fell 0.3% over the year.
Other indicators point the same way. Job openings were little changed at 7.1 million in August, and a quits rate of 1.9% indicates limited worker bargaining power. Initial jobless claims eased through September to 197,000 in the week ending September 26.
For CPI, labor is not a near-term driver. Wage growth running below inflation reduces the risk that the energy shock turns into a wage–price spiral. It also limits cost pressure on labor-intensive services such as restaurants and personal care. The September employment report, released October 2, will be incorporated in the next update.
4. Manufacturing, Logistics, and Supply Chain
Pipeline price pressure broadened in September. The ISM Manufacturing Prices index jumped 6.8 points to 77.9, close to its March level at the start of the energy shock, and supplier deliveries slowed for a tenth consecutive month. All five regional Federal Reserve manufacturing surveys reported higher prices paid in September. The Kansas City Fed's prices-received index reached its highest level since July 2022, and the New York Fed's prices-paid index edged above its recent four-year high.
Producer data show the pressure moving through the supply chain. In August, producer prices for finished consumer goods excluding food and energy rose 0.4%. Truck freight costs rose 2.0% on the month and 14.3% over the year. During September, Shanghai–Los Angeles container rates climbed about 7%. The New York Fed's Global Supply Chain Pressure Index rose to 1.06 in August from 0.94.
The main cost drivers are fuel, freight, metals and petrochemicals, with AI-related electronics adding pressure to some goods; new tariffs play a smaller role. These costs typically reach consumer prices with a one- to three-month lag, so they pose a greater risk to October and November CPI than to September.
5. Shelter and Housing
Shelter, about 35% of the CPI basket, remains on a disinflationary path. In August CPI, rent and owners' equivalent rent each rose 0.2%, down from 0.3% in July. Total shelter rose 0.3%, but that pickup came from hotel prices, which rebounded 2.4% after two monthly declines, not from housing costs.
Market rents suggest the disinflation phase is maturing. Zillow's rent index rose 2.5% year-on-year in August, up from 2.0% a year earlier. Apartment List reported its smallest September seasonal decline in years, with vacancy easing to 7.0%. New supply is thinning: housing completions fell 27.1% year-on-year in August. Mortgage rates reached 7.28% on October 1, according to Freddie Mac, which may push more households toward renting.
CPI rent reflects leases renewed over the past six to twelve months. These signals therefore point to firmer rent inflation in 2027, not in September. For now, the evidence supports rent and owners' equivalent rent staying near their recent monthly pace, with hotel prices the main swing factor for September shelter.
6. Food and Agriculture
Food price pressures are mixed. At the wholesale level, key proteins are easing. Cattle prices fell 6.4% in August, wholesale beef fell 3.0%, and farm milk prices fell 7.5%. New York wholesale egg prices dropped from an August average of 111.4 cents per dozen to about 82 cents in September. An expanded low-tariff quota for lean beef imports opened on September 1.
Against that, transport costs are climbing. Diesel prices rose 15% in September, truck freight costs are 14.3% above a year earlier, and farm-level wheat prices are up 35.1%. These costs usually reach grocery shelves with a lag of one to six months.
The USDA's September Food Price Outlook forecasts 2026 inflation of 2.4% for food at home and 3.5% for food away from home, with beef up 9.4% and eggs down 29.4% for the year. Restaurant prices rose 0.3% in August, and Federal Reserve business contacts report customer resistance to further menu increases. For September, the evidence points to food at home flat to modestly higher and food away from home close to 0.3%.
7. Services Inflation and Fed Signaling
The Federal Reserve raised its policy rate by 0.25 percentage points to 3.75–4.00% on September 16. The unanimous decision stated that "inflation remains elevated." The median projection for 2026 PCE inflation rose to 3.7%, and 16 of 18 policymakers expect at least one more increase this year. Chair Warsh said the goal is to ensure that relative price changes "don't broaden out." New York Fed President Williams said he now expects "somewhat larger and longer-lasting effects from energy prices on inflation."
Household inflation expectations rose sharply. The University of Michigan's one-year measure jumped to 4.6% from 4.0%, and its long-run measure edged up to 3.4%. Market measures held steady: five- and ten-year breakeven inflation rates both ended September at 2.36%, five basis points above end-August.
Underlying services inflation remains moderate. August core PCE rose 0.2% (3.0% over the year), while core CPI stood at 2.4%, partly because CPI gives a heavier weight to slowing shelter costs and includes falling insurance indexes. For September, the key risk is energy costs spreading into services prices; the Fed's tightening will act only with a lag.
8. High-Volatility CPI Components
The volatile components point in different directions. Airfares face the clearest upward pressure. Gulf Coast jet fuel averaged about $4.37 per gallon in September, 17% higher than in August and roughly double its level a year earlier. American Airlines and United have warned of capacity cuts, and CPI airfares were already 23.4% above a year earlier in August. Hotel room rates also firmed: industry data show average daily rates set a weekly record in mid-September. Part of that gain reflects holiday timing, however, and the CPI hotel index could give back some of August's 2.7% jump.
On the other side, wholesale used-vehicle prices have fallen for three consecutive months. Cox Automotive's Manheim index for mid-September was down 1.0% from August. Used-car CPI typically follows wholesale prices with a lag of about two months, which points to softer readings ahead, although retail listing prices remain firm. Motor vehicle insurance and health insurance indexes continue to decline, and new-vehicle price growth has slowed as incentives rise. Wireless phone services, which jumped 5.9% in August, are a candidate for a partial reversal.
Our CPI Forecast is based on research
Our empirical study is benchmarking XTech CPI forecast against the world's leading economists and consensus polls.
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