The Quick Read: There is no fixed number of months, and the calendar is not the real issue this fall. The issue is how long your rate stays unprotected between finding a house and closing on it. As of September 28, 2026, Freddie Mac’s survey shows the 30-year average up four weeks in a row. My advice: once you like the number, lock it.
The rest of this column gives the dated facts, what they mean for buyers, and what I would do about it.
What Changed in September
Mortgage rates rose every week this month, and the 10-year Treasury yield hit its highest level since 2007. Buyers who priced a purchase in early September are now looking at a different cost of money.
Freddie Mac’s survey put the 30-year fixed at 6.71% for the week of September 3, up from 6.66% the week before. The next three readings were 6.76% on September 10, 6.95% on September 17, and 7.03% on September 24. That is 37 basis points in four weeks. A year earlier, the same Freddie Mac survey had the 30-year fixed 73 basis points lower. The survey’s 15-year average also rose, by 16 basis points.
One week stands out. The September 17 reading jumped 19 basis points on its own.
Why did it move? Start with the Fed. On September 16 the FOMC voted 12–0 to raise its target range by a quarter point, to 3-3/4 to 4 percent. CNBC called it the first increase since 2023. The statement said inflation remains elevated.
Here is the catch, and a common misreading. The Fed does not set mortgage rates. Mortgage rates track longer-term yields, and those moved more than the Fed did. CNBC reported on September 26 that the 10-year yield leapt to 5.23% on Friday, its highest since 2007. It said the yield traded just below 4.8% earlier this month. A day earlier, CNBC tied the climb to elevated inflation, especially higher oil prices, and to expectations of at least one more Fed hike this year. The same report gave the 10-year as 5.208% on Thursday. Different snapshots, same message: above 5.2%.
The odds of more to come are not settled. CNBC cited CME FedWatch at 64% for another hike in October as of September 26. A separate September 16 commentary from Advisor Perspectives described markets as pricing a December hike. The sources disagree, and I am not going to pretend to know which is right.
Which Rate Is “The” Rate?
No single number is the rate. Freddie Mac, the MBA and Mortgage News Daily each measure something different, so they land in different places on the same week.
Freddie’s weekly figure is an average, not a single day’s quote. It covers conventional, conforming, fully amortizing purchase loans for borrowers with 20% down and excellent credit. It is not a non-QM number. It is not a tight-debt-to-income number either. It also lags, because Mortgage News Daily notes that Freddie’s figure blends quotes collected from the prior Wednesday through the day before release. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
The daily market looks different. Mortgage News Daily’s index moved up by about 19 basis points in a single day, between September 23 and its September 24 commentary. The same commentary says the daily index first broke the 7% mark on September 10, two weeks before Freddie Mac’s weekly average did. So “rates just crossed 7%” is half right. The daily market crossed two weeks before the weekly survey caught up.
The MBA sits in between. Its September 23 release put the 30-year contract rate at 7.12%, up from 6.97%.
Why does this matter to you? Because quotes gathered on different days, or read from different surveys, are not comparable. A number you saw on a headline last Thursday is not a number you can plan on today. A lock turns a moving market into one fixed input. A survey average does not.
What It Means for Home Buyers
Higher rates raise the cost of waiting, and they raise the cost of the gap between a signed contract and a closed loan. That second gap is the part most buyers underrate.
Here is the plain version. Buying a house has three stretches: getting ready, searching, and the stretch from accepted offer to closing. Rising rates do not change how long the paperwork takes. They change what each stretch costs you in rate exposure. Until you lock, the rate on your loan is whatever the market says on the day you lock.
NAR notes that a home typically goes under contract a good while before it closes. Every day in that gap, a floating rate can move against you. Four straight weekly increases in Freddie’s survey is a fair reminder of what that looks like.
The demand data shows buyers reacting, but not panicking. The MBA’s September 23 report, covering the week ending September 18, showed the Market Composite Index down 1.5% on a seasonally adjusted basis. The seasonally adjusted Purchase Index fell 1%. The unadjusted Purchase Index rose 9%, but that reflected the Labor Day adjustment, and it was still 11% below a year earlier. Refinance applications fell 3% and sat 62% below a year ago. Purchase demand is stable but well below last year.
The housing data is mixed too. NAR’s August report of September 10 showed existing-home sales down 2.0% from July and 1.2% from a year earlier. NAR’s housing snapshot for August data shows a pace of 3.98 million, inventory of 1.62 million homes, supply of 4.9 months, and a median existing-home price of $429,100. July fell 1.7% and June fell 2.4%, so that is three straight monthly declines.
Falling sales do not mean falling prices. NAR says the median price is still rising, up 1.6%. More inventory gives a buyer more to choose from. It does not make the loan cheaper.
New-home buyers have a different story. Census data released September 24 put August new-home sales at a 684,000 annualized pace, with supply at 8.5 months. That sales gain of 6.4% was within the margin of error, so do not read it as a recovery. Inman reported that 38% of builders cut prices in September and 66% used incentives, citing the NAHB Housing Market Index. A builder incentive is worth asking about. Just compare it against the cost of the loan, not in isolation.
My Take
I think the buyers who lose the most this fall are the ones who wait for a “good enough” number to appear on their own.
Here is my read. Nothing in the data says the streak continues. Four weeks up does not predict a fifth. The 10-year could reverse, and one analyst told CNBC on September 25 that there may be a buying opportunity in bonds. I am not forecasting a rate. Nobody who claims to know where the 10-year goes next has earned your trust on it.
My point is about exposure, not prediction. If you like where your payment lands today, the market is offering you a chance to hold it. If you float and rates fall, you gain. If you float and they rise, you absorb the move, and on a tight budget that can decide whether the deal still works.
Tight budget means tight debt-to-income. That ratio is your monthly debt payments divided by your gross monthly income, and lenders review it closely. No source in my brief measures buyers’ debt-to-income directly, so this part is my own inference from the rate move. But the logic is simple. A buyer with room in the budget can absorb a rate bump. A buyer close to the edge cannot. For that buyer a quarter point can change whether the file works at all.
It is a toss-up for buyers with room to spare. A floating buyer with a cushion is making a reasonable bet. I would still not make it casually in a month like this one.
The Fed’s own chair pointed at longer yields, citing a strengthened economy and competition for capital. Chair Warsh’s September 16 press conference did not sound like a central bank expecting yields to drop soon. Freddie chief economist Sam Khater said in the September 24 release that the housing market remains supported by a solid labor market and a healthily growing economy. Both sound like conditions that could keep rates elevated. Neither is a promise.
What I’d Do Now
Lock once you like the number, and build the rest of your plan around that decision. Here is the order I would work in.
Get your financing picture straight before you tour. Know what payment you can carry and what debt-to-income ratio a lender will review. Do this before you fall for a house, not after. Preparation is the part of the timeline you control.
Decide your lock plan before you make an offer. A rate lock is an agreement that holds a quoted rate for a set period while your loan is processed. Ask how long the lock runs, what happens if closing takes longer than expected, and when you can lock. Do not learn those answers after the market has moved.
Lock when the number works, not when you feel certain. Certainty does not arrive in a market like this. If the payment fits your budget with some room, lock it. If it only fits if rates fall, you are not buying a house. You are placing a bet.
If your budget is tight, treat the lock as a requirement. A buyer with little room is the buyer most hurt by a late move. For that buyer, I would not float into closing.
Compare quotes on the same day. Because of the way rates moved this month, two quotes a week apart are not the same product. Ask for quotes on the same day, for the same loan type, and read the differences from there.
Look beyond the standard conventional loan if your file is not standard. Freddie’s survey describes a borrower with 20% down and excellent credit. Many buyers are not that borrower. Self-employed buyers and buyers with non-traditional income are often outside that sample, and so are investors. Our loan options page describes what each program is reviewed on and carries the current guidelines, subject to lender guidelines.
Investors should note one shift. HousingWire reported on September 12, citing Optimal Blue, that investor and DSCR loans made up 35% of non-QM production in August 2026, up from 28% in August 2025. A DSCR loan is reviewed mainly on a rental property’s income rather than the borrower’s personal income. If you are weighing a rental purchase, our DSCR loans guide explains how it works.
And watch the calendar. NAR’s next pending-home-sales release is October 20. The Fed could move again in October or December. Plan on either without predicting either.
If you’re weighing a purchase or a refinance this fall, Lendmire can walk you through how the current programs fit your file.
Frequently Asked Questions
How long does it take to buy a house when rates are rising?
It takes as long as your preparation, your search and your contract-to-close stretch take, and rising rates do not change those steps. What they change is the cost of the open gap. I won’t give you a generic day count, because your file, your market and your property drive it. Focus on when you can lock.
Should I wait for rates to come back down?
I can’t tell you rates will fall, and neither can anyone else. Freddie Mac’s survey showed 6.30% a year ago and 7.03% for the week of September 24, but a four-week streak says little about the fifth week. If the payment works for your budget today, waiting is a bet. If it doesn’t, waiting may be the right call.
Is Freddie Mac’s 7.03% the rate I will be quoted?
Probably not. That figure is a weekly average for conventional, conforming loans with 20% down and excellent credit. The MBA’s contract rate was 7.12% in its September 23 release, and Mortgage News Daily’s index was 7.45% on September 24. Your quote depends on your file and the day. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
When should I lock my rate?
Once you like the number, especially if your debt-to-income ratio is tight. A lock holds the quoted rate for a set period. If your budget has room, floating is a reasonable choice. A buyer with little room should not float in a market that moved this way.
Do falling home sales mean prices are dropping?
No. NAR reported August existing-home sales down 2.0% on September 10, but the median existing-home price was still $429,100, and NAR says prices are still rising. New-home prices are noisier. Census flagged the August sales gain as within its margin of error.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage broker with two platforms: DSCR investor lending across 41 markets, including Washington, D.C., and consumer mortgage programs in 16 states, all arranged through wholesale lending partners. This column is written by Lendmire’s founder and reflects the market as of its publication date; program terms and availability are set by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Freddie Mac Primary Mortgage Market Survey
2. Freddie Mac release, September 3, 2026
3. Freddie Mac release, September 10, 2026
4. Freddie Mac release, September 17, 2026
5. Freddie Mac release, September 24, 2026
6. Federal Reserve FOMC statement, September 16, 2026
7. CNBC, Fed decision, September 16, 2026
8. CNBC, 10-year Treasury yield, September 26, 2026
9. CNBC, 10-year Treasury yield, September 25, 2026
10. Advisor Perspectives, September 16, 2026
11. MBA Weekly Applications Survey, September 23, 2026
12. NAR existing-home sales snapshot
13. Inman, new-home sales, September 25, 2026
This article is part of Lendmire’s Mortgage News series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: Why A Local Real Estate Broker Matters As Buyers Gain Leverage, September 2026? · September 2026: Buyers Need A Real Estate Agent As Supply Grows, Rates Climb · Listing Your Home For Sale This Fall As Inventory Climbs And Rates Rise
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.