The average 15-year fixed mortgage rate also increased, reaching 6.42%, compared with 6.26% the previous week. Both benchmarks have risen considerably since late August, changing the financial calculations for prospective borrowers.
The latest figures illustrate how relatively small movements in mortgage interest rates can translate into substantial differences in monthly payments, particularly for households purchasing expensive properties or financing most of their purchase price.
Although Freddie Mac's chief economist pointed to continued support from employment and economic growth, the increase in borrowing costs introduces another affordability consideration for buyers entering the housing market.
Mortgage Rates Have Risen Steadily Since Late August
Freddie Mac's historical survey figures show that the latest increase is part of a broader upward movement rather than an isolated weekly change.
On August 27, the average 30-year fixed mortgage rate stood at 6.66%. It subsequently reached 6.71% on September 3, 6.76% on September 10 and 6.95% on September 17.
The September 24 reading of 7.03% represents an increase of 0.37 percentage points over four weeks.
The movement has been particularly pronounced during the second half of September. Between September 10 and September 24, the average 30-year rate increased by 0.27 percentage points.
Borrowers considering shorter repayment periods have experienced similar developments.
The average 15-year fixed mortgage rate rose from 5.98% on August 27 to 6.42% on September 24, an increase of 0.44 percentage points.
Compared with the corresponding period in 2025, the latest figures also indicate substantially higher borrowing costs.
The average 30-year rate was 6.30% one year earlier, while the 15-year benchmark stood at 5.49%.
These comparisons demonstrate that prospective borrowers face higher average financing rates than those recorded during the equivalent period last year.
However, national averages do not establish the interest rate available to every applicant. Individual mortgage offers depend on several factors, including creditworthiness, loan size, repayment period and lender requirements.
What a 7.03% Mortgage Means for Monthly Payments
The financial consequences of higher mortgage rates become clearer when examining how they affect a typical repayment calculation.
Consider a hypothetical buyer borrowing $400,000 through a conventional 30-year fixed-rate mortgage.
At an annual interest rate of 6.66%, the monthly principal and interest payment would be approximately $2,570.
At 7.03%, that payment would increase to approximately $2,670.
The difference is roughly $100 per month, or approximately $1,200 annually.
Over a full 30-year repayment period, assuming the borrower retains the mortgage without refinancing or making additional principal payments, the cumulative difference would approach $36,000.
These calculations are illustrative rather than representative of every mortgage transaction.
They exclude property taxes, homeowners insurance, mortgage insurance, lender fees and other potential homeownership expenses.
They also assume the same principal balance and repayment term in both scenarios.
Nevertheless, the comparison demonstrates why changes measured in fractions of a percentage point can materially affect household budgets.
Higher interest rates can also influence the maximum mortgage amount a household qualifies for when lenders assess monthly debt obligations against income.
For buyers operating within a fixed monthly budget, an increase in financing costs may require a larger down payment, a smaller loan or a different property purchase price.
Freddie Mac's Survey Measures National Financing Conditions
Freddie Mac's Primary Mortgage Market Survey provides a widely followed measure of mortgage financing conditions in the United States.
The survey draws on mortgage applications submitted to Freddie Mac through its Loan Product Advisor system by lenders operating across the country.
Its principal benchmarks focus on conventional, conforming, fully amortizing home purchase mortgages involving borrowers with excellent credit and a 20% down payment.
Consequently, the published figures should be understood as national reference rates rather than guaranteed financing offers.
Borrowers with different credit profiles, down payments or mortgage structures may encounter different borrowing conditions.
The survey is also distinct from a lender's individual mortgage quotation.
A lender may adjust available rates and associated fees according to prevailing market conditions, the characteristics of the application and its own pricing requirements.
The distinction matters because the advertised interest rate is only one component of the overall cost of borrowing.
The annual percentage rate, commonly known as APR, can provide additional information by incorporating certain financing charges into a broader measure of borrowing costs.
Consumers comparing mortgage products should therefore examine both interest rates and applicable charges rather than relying exclusively on the national weekly benchmark.
Employment and Economic Growth Remain Important Factors
Despite the latest increase in borrowing costs, Freddie Mac's assessment highlighted continuing support for the housing market from broader economic conditions.
Sam Khater, the institution's chief economist, identified labor market conditions and economic growth as factors supporting housing activity.
Employment is particularly relevant to mortgage demand because household income and job stability influence borrowers' capacity to qualify for financing and maintain regular payments.
However, favorable employment conditions do not eliminate the affordability challenges associated with higher mortgage rates.
The relationship between economic activity and housing finance is complex.
Mortgage interest rates are influenced by financial market expectations, longer-term bond yields, inflation developments and the broader economic outlook.
Federal Reserve monetary policy can affect these conditions, but the central bank does not directly determine the interest rate offered on individual 30-year fixed mortgages.
This distinction is important when interpreting changes in borrowing costs.
A movement in mortgage rates should not automatically be attributed to a single monetary policy decision without supporting evidence.
Similarly, the latest Freddie Mac figures establish that borrowing costs increased, but they do not independently establish how many potential buyers postponed purchases or how national home prices responded.
Those questions require additional housing transaction, mortgage application and property price data.
Higher Rates Change the Calculation for Prospective Buyers
The latest increase has implications for households evaluating whether they can afford a property at prevailing prices.
A buyer who obtained a mortgage quotation several weeks earlier may find that a comparable loan now carries a higher monthly repayment.
The difference can become particularly significant for households approaching the upper limits of their borrowing capacity.
For example, a household with a fixed monthly housing budget may need to reassess its intended purchase price when interest rates increase.
Alternatively, a larger down payment could reduce the principal balance and offset part of the additional interest expense.
Neither option is universally available.
Accumulating additional savings may delay a purchase, while selecting a less expensive property depends on local housing availability and individual household requirements.
Buyers also face decisions about mortgage terms.
A 15-year fixed mortgage generally involves larger monthly principal repayments than a comparable 30-year mortgage, although its shorter repayment period can substantially reduce total interest expenses.
The September 24 survey reported a 15-year average of 6.42%, below the corresponding 30-year average of 7.03%.
However, comparing the two interest rates alone would be misleading because their repayment periods differ considerably.
The appropriate comparison requires examining monthly affordability, total borrowing costs and the borrower's financial circumstances.
Prospective buyers can also compare quotations from multiple lenders, paying attention to interest rates, APRs, closing costs and the conditions governing rate locks.
These considerations become increasingly relevant when national mortgage benchmarks are changing from week to week.
The Next Survey Will Show Whether the Increase Continues
Freddie Mac's September 24 figures establish that average fixed mortgage rates have increased over several consecutive weeks.
They do not, however, determine whether rates will continue rising, stabilize or decline during the coming weeks.
The next scheduled Primary Mortgage Market Survey release is October 1, 2026.
That publication will provide another weekly reference point for assessing changes in national borrowing conditions.
Until then, the latest data show a 30-year mortgage benchmark above 7%, a higher 15-year rate and a substantial increase compared with the equivalent period in 2025.
For prospective homebuyers, the immediate significance lies in the relationship between financing costs and purchasing power.
Even when the underlying property price remains unchanged, a higher mortgage interest rate can increase the monthly financial commitment required to complete a purchase.
The September figures therefore reinforce the importance of evaluating current financing terms alongside property prices, household income and the full costs of homeownership.