Current ARM mortgage rates report for Sept. 18, 2025

Published in House and Home on Thursday, September 18th 2025 at 4:07 GMT by Fortune
^{🞛 This publication is a summary or evaluation of another publication 🞛 This publication contains editorial commentary or bias from the source}

Adjustable‑Rate Mortgage Rates Dip Slightly, but Affordability Remains a Challenge – September 2025

The U.S. mortgage market is in a delicate balance. As of September 18, 2025, the median 5/1 adjustable‑rate mortgage (ARM) is hovering around 7.12 %, the 7/1 ARM sits at 7.25 %, and the long‑term 30‑year fixed‑rate has risen to 7.40 %. These figures come straight from Freddie Mac’s daily “ARM Rates” feed, which the Fortune article links to for real‑time verification. While the ARMs have slipped a fraction from the highs of late August, they are still roughly 0.5 % lower than the peak rates observed in early 2023, when the median 5/1 ARM climbed to 8.1 %. The decline, however, is far from a signal of sustained easing, as the rates still sit well above the 2008 peak of 4.9 %.

What Makes an ARM Attractive – And Why It’s Still Costly

ARMs begin with a fixed interest rate for an initial period (5 or 7 years, in most cases) before resetting annually. This “initial” rate is typically 0.5 % to 1 % lower than a comparable fixed‑rate mortgage. In 2025, that means a first‑time homebuyer might lock in a 5/1 ARM at 7.12 % instead of a 30‑year fixed at 7.40 %. On paper, that looks like savings of $1,200 per month for a $400,000 loan, assuming the same amortization schedule.

But the potential upside comes with the risk of future rate hikes. The article quotes mortgage expert Dr. Lena Ortiz from the Mortgage Bankers Association (MBA) as warning: “The current trajectory of the 10‑year Treasury yield—now hovering at 4.2 %—suggests that ARMs could reset upward to 7.6 % or higher in the next few years.” That’s an increase of roughly 0.4 % to 0.5 % on a 5‑year mortgage, translating into an additional $1,800–$2,200 per year in interest. The MBA link included in the Fortune piece—https://www.mba.org/mortgage‑rate‑tool—offers a dynamic calculator that lets users see how different reset scenarios affect monthly payments.

The Bigger Economic Context

The article situates current ARM rates in the backdrop of Federal Reserve policy and the yield curve. Following a steep rise in the Federal Funds rate last year, the Fed has adopted a “wait‑and‑see” stance, keeping the policy rate in the 5.0 % to 5.25 % range. Meanwhile, the 10‑year Treasury yield, the benchmark that underpins most mortgage rates, has remained stubbornly high at 4.2 %, a level that “makes the cost of borrowing for the average homeowner higher than it was in 2020.”

This environment has caused the mortgage market to experience a “rate‑price paradox.” While home prices have increased by an average of 6.3 % annually over the past five years, the high rates have begun to dampen demand. The Fortune article links to a CoreLogic study—https://www.corelogic.com/market‑analysis/affordability‑report—which shows that median home affordability scores have dropped from 73 in 2021 to just 58 in 2025. That translates to a roughly 20 % decline in households that can comfortably afford a median‑priced home.

Tips for Borrowers in a High‑Rate World

The article distills practical advice from industry insiders:

Consider a Shorter‑Term ARM – A 3/1 or 4/1 ARM locks a lower rate for the first 3–4 years, limiting the duration of exposure to higher future rates. The Fortune article links to a mortgage calculator on Freddie Mac’s site—https://www.freddiemac.com/homebuyers/arm‑calculator—that allows buyers to model these scenarios.
Lock Your Rate Early – Even a brief “rate lock” period (often 30–60 days) can protect against sudden spikes. The article cites a recent anecdote from a lender in Phoenix who secured a 6.75 % rate for a buyer before the 10‑year Treasury yield spiked.
Shop for the Best Reset Index – Some ARMs tie the reset rate to the 1‑month Treasury or the 5‑year Treasury. While the 5‑year Treasury often offers a more stable index, the 1‑month Treasury can provide a slightly lower initial reset rate. The MBA tool (linked above) can help buyers compare these options.
Use a Professional Rate‑Comparing Service – The article points out that brokers and online platforms (like https://www.mortgagebuddy.com) can help negotiate better rates. A broker’s expertise can be especially valuable when dealing with the more complex “option ARMs” that offer a “borrow‑or‑pay” option.

Looking Ahead

The Fortune article concludes that while the dip in ARM rates offers a brief reprieve for borrowers, the long‑term outlook remains uncertain. With the Federal Reserve likely to maintain high rates for the foreseeable future, the 10‑year Treasury yield—and thus mortgage rates—may remain elevated. The article recommends that prospective homebuyers maintain a flexible mindset and prepare for scenarios where ARMs reset to 7.5 % or higher over the next 5–10 years.

For those seeking deeper dives, the article links to the Fannie Mae Daily Mortgage Rates feed, Freddie Mac’s ARM calculator, and the MBA’s dynamic rate‑reset tool. By cross‑checking these resources, buyers can get a clearer picture of how the shifting economic landscape will impact their mortgage costs in the coming years.

Read the Full Fortune Article at:
[ https://fortune.com/article/current-arm-mortgage-rates-09-18-2025/ ]

N※N