Mortgage rates today, September 21, 2026, start the new week with the latest published Optimal Blue 30-year conforming benchmark at 7.01%, the 15-year at 6.39%, and Bankrate’s national average 5/1 ARM APR at 6.75%. The fixed-rate benchmarks still reflect Thursday’s rate locks, not Friday’s market. That distinction matters because the 10-year Treasury finished Friday at 5.01%, seven basis points above Thursday’s close, while the Federal Reserve’s quarter-point hike from last week continues to shape expectations for the front end of the yield curve.
Mortgage Rates Today: What’s Trending
The latest published 30-year benchmark eased from 7.047% on Wednesday to 7.013% on Thursday, a decline of about three basis points, but it remains 13 basis points above September 10 and roughly 31 basis points above the comparable mid-August reading. The broader trend is therefore still higher even though Thursday produced a small pullback from the one-year high.
Today’s rate in context
At 7.01%, principal and interest on a $400,000 30-year loan is about $2,664 a month. A $400,000 home purchased with 20% down leaves a $320,000 loan and a principal-and-interest payment of about $2,131 a month.
What to do right now
Treat 7.01% as a published benchmark, not as a live Monday quote. Friday’s Treasury market moved after Thursday’s mortgage observation, and lenders can reprice before the delayed national index catches up. Get a fresh quote today and compare it with the benchmark rather than assuming they should match.
Where Rates Are Headed
The 10-year Treasury closed Friday at 5.01%, up from 4.94% Thursday and 4.97% Monday. That keeps the long end of the curve under pressure even after the Fed moved its overnight target range higher. On Thursday, the last session with both benchmarks available, the 7.013% mortgage index sat about 207 basis points above the 4.94% 10-year Treasury yield.
What could move rates next
Monday’s first data event for this page is the delayed September 18 Optimal Blue observation itself. Beyond that, September flash PMI data arrive Wednesday, new-home sales Thursday, and durable-goods orders Friday. The next PCE inflation report is not until September 30, so this week’s mortgage market is more likely to trade growth data and Treasury yields than a fresh inflation release.
What’s Moving the Market
The Fed raised the federal funds target range by 25 basis points last Wednesday to 3.75%–4.00%. Fixed mortgage rates do not move one-for-one with that policy rate; the more immediate channel is how the decision changes Treasury yields, mortgage-backed-securities pricing, volatility and lender margins.
The driver right now
Friday’s 5.01% 10-year Treasury close is the cleaner signal for Monday than the Fed hike by itself. The move reversed Thursday’s bond rally and leaves long-term yields near the upper end of last week’s range. If the 10-year can hold below 5%, lenders have room to improve; if it pushes decisively above 5%, mortgage quotes can remain sticky even if the next Optimal Blue observation prints below 7%.
What This Rate Means for Homebuyers
A $400,000 home with 20% down leaves a $320,000 mortgage. At 7.01%, principal and interest is about $2,131 a month. On a full $400,000 loan, the payment is about $2,664.
Lock or float?
If your closing is near and today’s payment works, locking can reduce the risk of another Treasury selloff. If you have more time, waiting for the Friday Optimal Blue observation to publish today is reasonable, but do not confuse a delayed benchmark with a live lender quote. Ask the lender whether a float-down is available after locking and what it costs.
Mortgage Rates Today: Monthly Payment Estimates
| Home Price | 3% Down | 10% Down | 20% Down |
|---|---|---|---|
| $300K | $1,938 | $1,798 | $1,598 |
| $400K | $2,584 | $2,398 | $2,131 |
| $500K | $3,230 | $2,997 | $2,664 |
Principal and interest only. Does not include taxes, insurance or PMI.
For First-Time Homebuyers
A $285,000 starter loan costs about $1,898 a month in principal and interest at 7.01%. Program choice can matter as much as a small daily rate move: on the latest Optimal Blue release table, FHA and VA benchmarks were below the conforming index.
Getting in with less down
FHA minimum-down-payment rules remain 3.5% with a qualifying credit score of 580 or higher and 10% down for scores from 500 to 579; borrowers below 500 are not eligible under FHA’s minimum credit-score rules, and lenders may impose stricter overlays. Compare the full monthly cost including mortgage insurance, not just the headline note rate.
Affordability Snapshot
Assumes a $100,000 household income, a 28% front-end housing ratio, roughly 20% of that housing budget reserved for taxes and insurance, 10% down, and a 30-year term. It is not a pre-qualification.
What This Rate Means for Refinancers
A $350,000 balance at 7.25% costs about $2,388 a month. At 7.01%, the same balance is about $2,331, a difference of roughly $57 a month before closing costs.
Is it worth it yet?
There is no universal refinance threshold. Divide closing costs by monthly savings to estimate break-even months, then compare that with how long you expect to keep the loan. At a $57 monthly saving, even modest closing costs can take years to recover.
For Real Estate Investors
Illustrative investor pricing, roughly 60 basis points above the latest conforming benchmark, runs near 7.61%. A $225,000 loan at that rate is about $1,590 a month in principal and interest.
Making the numbers work
Underwrite the deal to the rate a lender can actually lock, keep vacancy and maintenance assumptions intact, and treat any post-Fed rally as upside rather than something the property must depend on.
15-Year vs 30-Year: Which Is Right for You?
On a $350,000 loan, the 30-year at 7.01% costs about $2,331 a month and about $489,128 in total interest if held to maturity. The 15-year at 6.39% costs about $3,028 a month and about $194,995 in total interest.
Who the 15-year fits
The 15-year benchmark is about 62 basis points below the 30-year on the rates shown here. That saves roughly $294,132 in lifetime interest on a $350,000 loan, but requires about $697 more per month. The shorter term works best when the higher required payment still leaves enough room for savings and other obligations.
The Latest Published Rate Is Still Near a One-Year High
The latest 7.01% reading is only about four basis points below the one-year high of 7.05% set on September 16. The 52-week low remains 5.90% from February 27. Compared with the September 17, 2025 Optimal Blue reading of 6.195%, today’s published benchmark is about 82 basis points higher.
What that means for a payment
A $400,000 loan costs about $2,664 a month at 7.01% versus about $2,449 at 6.195%. That is roughly $215 more each month, or about $2,584 a year, before taxes and insurance.
The Bottom Line
Mortgage rates enter Monday with the latest published 30-year benchmark at 7.01%, the 15-year at 6.39%, and Bankrate’s 5/1 ARM APR at 6.75%. The benchmark is slightly below last week’s high but still elevated, and Friday’s 5.01% Treasury close argues against assuming the small Thursday mortgage-rate decline will continue automatically.
Your move
Get a fresh Monday quote, compare at least three lenders using the same points and fee assumptions, and ask exactly how long the lock lasts. If the payment works and your closing is close, certainty can be valuable; if you have time, watch the 10-year Treasury and the next Optimal Blue update rather than trying to guess the Fed from headlines alone.
What to watch next
Watch today’s publication of the Friday Optimal Blue observation first. After that, September flash PMI data on Wednesday, new-home sales Thursday and durable-goods orders Friday are the main scheduled growth releases before PCE inflation returns on September 30.
Frequently Asked Questions
What are mortgage rates today for a 30-year fixed?
The latest published Optimal Blue 30-year conforming benchmark is 7.01%, based on the September 17 observation. Live September 21 lender quotes may differ because Friday’s September 18 benchmark is scheduled to publish today.
What are mortgage rates today for a 15-year fixed?
The latest published 15-year Optimal Blue benchmark shown here is 6.39%. It is a note-rate benchmark, while the 5/1 ARM figure on this page is an APR from Bankrate.
Why can Monday lender quotes differ from the published 7.01%?
Optimal Blue publishes with a lag. The 7.01% figure reflects Thursday rate locks, while Treasury and mortgage-backed-securities markets continued trading Friday. Lenders can reprice before the national benchmark updates.
Should I lock in mortgage rates today?
That depends on your closing timeline, budget and tolerance for rate changes. If you are closing soon and the current payment works, locking can be the more conservative choice; if you have more time, compare a fresh lender quote with today’s market before deciding.
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30-year and 15-year figures are note-rate benchmarks from Optimal Blue; the latest published observations used here are for September 17, 2026. The 5/1 ARM figure is Bankrate’s national average APR as of September 21, 2026. Sources & further reading: Optimal Blue 30-Year via FRED, Optimal Blue 15-Year via FRED, U.S. Treasury Daily Rates, Federal Reserve September 16 FOMC statement, U.S. Census release calendar, BEA release schedule, and Bankrate 5/1 ARM rates.
