Mortgage rates today, September 12, 2026, close a shortened week of September 7–11 in which rates rose sharply. The latest published Optimal Blue 30-year conforming benchmark climbed from 6.77% on Tuesday to 6.88% on Thursday, an 11-basis-point rise that set a new 52-week high. Friday’s mortgage-rate observation has not published yet, but the bond market gives the direction of travel: the 10-year Treasury finished Friday at 4.96%, up from 4.80% Tuesday, after a hotter producer-price report and a firm consumer-inflation reading kept pressure on long-term borrowing costs.
The Week in Review
Labor Day left Monday without a new Optimal Blue observation, so the published mortgage week began Tuesday at 6.766%. Wednesday moved to 6.805%, which rounds to 6.81%, and Thursday accelerated to 6.880%. That is an 11.4-basis-point rise from the first published observation of the week to the latest one available as of Saturday. Friday’s September 11 Optimal Blue reading is still pending and is scheduled to publish Monday.
Day by day
| Session | 30-Year OBMMI | 10-Year Treasury | What mattered |
|---|---|---|---|
| Mon Sep 7 | Holiday | Holiday | Labor Day; no new daily observation |
| Tue Sep 8 | 6.77% | 4.80% | First session after the holiday |
| Wed Sep 9 | 6.81% | 4.83% | Rates and yields moved higher together |
| Thu Sep 10 | 6.88% | 4.95% | PPI +0.4% m/m; bond selloff deepened |
| Fri Sep 11 | Pending | 4.96% | CPI 3.4% y/y; core +0.3% m/m |
The important distinction
Friday’s mortgage observation being unpublished does not mean lenders were still using Thursday’s market. Treasury and mortgage-backed-securities markets traded Friday’s CPI report in real time, and live lender rate sheets could reprice before the Optimal Blue index appears. The 6.88% figure is therefore the latest published benchmark, not a claim that Friday’s market was unchanged.
What Drove Rates This Week
The bond market did most of the damage. The 10-year Treasury rose from 4.80% Tuesday to 4.96% Friday, a 16-basis-point move across the shortened trading week. Mortgage pricing followed: between Tuesday and Thursday, the Optimal Blue 30-year benchmark climbed 11 basis points. The same-day mortgage-to-Treasury spread actually narrowed slightly, from about 197 basis points Tuesday to about 193 basis points Thursday, so the week was primarily a higher-yield story rather than a widening-spread story.
PPI hit first
Thursday’s Producer Price Index was the first major inflation shock. Final-demand prices rose 0.4% in August and 5.4% over the prior 12 months. The 10-year Treasury finished Thursday at 4.95%, up 12 basis points from Wednesday.
CPI did not deliver clean relief
Friday’s August CPI showed headline inflation up 0.4% for the month and 3.4% from a year earlier. Core CPI rose 0.3% month over month and 2.4% year over year, a monthly pace that leaves the Fed little room to ease. The 10-year yield finished the day at 4.96%, leaving long-term borrowing costs near the week’s highs heading into the Federal Reserve’s meeting on September 16.
Want the forward view? See MortgageDaily’s Mortgage Rate Forecast
The Latest Published Rate Is a New 52-Week High
Thursday’s 6.88% Optimal Blue reading is the highest published 30-year conforming benchmark of the past year. The low was 5.90% on February 27, 2026. That places the latest published rate almost a full percentage point above the year’s low and about 61 basis points above the comparable September 10, 2025 reading of 6.27%.
What it means for a payment
On a $400,000 30-year loan, principal and interest at 6.88% is about $2,629 a month. At 6.27%, the same loan was about $2,468 a month. That is roughly $161 more per month, or about $1,930 a year, before taxes and insurance.
What it means for the lock decision
A 52-week high is not a ceiling, and it is not proof that rates must reverse. It does mean a borrower should treat a comfortable payment as valuable information. If the loan works at today’s quote and the closing window is short, protecting that payment can matter more than trying to call the next 10 basis points.
Forecast Check: The Week Ran Hotter Than the Base Case
MortgageDaily’s weekly base case had the 30-year ending the week near 6.78%. The forecast cannot be formally scored yet because Friday’s September 11 Optimal Blue observation has not published. Through Thursday, however, the published benchmark was already 6.88%—10 basis points above the base case—while the 10-year Treasury closed Friday at 4.96%.
Why we wait to score it
The forecast should be judged against the observation date, not the date FRED publishes it. Friday’s mortgage observation will be released Monday, and only then can the Sep 7–11 forecast be scored without look-ahead or publication-lag contamination.
The Week in One Line
Rates rose, inflation stayed sticky, and the bond market finished near its worst levels of the week. The latest published 30-year mortgage benchmark is 6.88%, up 11 basis points from Tuesday and at a new one-year high, while Friday’s final mortgage observation is still pending.
Your move
If you are shopping Monday, ask for a fresh quote rather than carrying a Thursday or Friday morning number into a new week. Compare lenders on the same day with the same assumptions for points and fees, and confirm the lock period and any float-down terms before the Federal Reserve meeting on September 16.
Frequently Asked Questions
How did mortgage rates change this week?
Among the Optimal Blue observations published so far for Sep 7–11, the 30-year fixed rose from 6.77% on Tuesday to 6.88% on Thursday, an increase of about 11 basis points. Friday’s Sep 11 observation is scheduled to publish Monday.
Why is Friday’s mortgage rate missing from the recap?
Optimal Blue’s daily benchmark publishes with a lag. The latest available observation as of Saturday is Thursday, Sep 10. Friday’s market still traded and lenders could reprice; the benchmark for that session is simply not published yet.
What moved mortgage rates this week?
The main driver was the Treasury market. The 10-year yield rose from 4.80% Tuesday to 4.96% Friday as a hot PPI report and a firm CPI report kept inflation and Federal Reserve risk in focus.
What should borrowers do before markets open Monday?
Get a fresh lender quote, compare at least three offers on the same day, and make sure points, fees and lock periods are matched. Do not assume the latest published 6.88% benchmark is the rate a lender will quote after Friday’s CPI reaction.
Most Read on MortgageDaily
| Explore More on MortgageDaily |
Recent Daily Rate Analysis
Live
The latest published 30-year figure is the Optimal Blue note-rate observation for September 10, 2026. The 15-year figure shown above is the latest independently verified Optimal Blue observation available in our source check, September 9. The 5/1 ARM figure is Bankrate’s national average APR as of September 11; methodologies and date bases differ and are not directly comparable. Sources & further reading: Optimal Blue (OBMMI) via FRED, U.S. Treasury Daily Rates, BLS PPI, BLS CPI, the Federal Reserve, Freddie Mac PMMS, and Bankrate 5/1 ARM APR.
