Fixed vs. ARM: Weighing Your Options With the 30-Year Above 7%

Mortgage rate averages moved higher in late September. Freddie Mac's Primary Mortgage Market Survey reported that the 30-year fixed-rate mortgage averaged 7.03% the week of September 24, 2026, up from 6.95% the week before. That is a national average for borrowers with 20% down and excellent credit, not a quote, and your own terms depend on your credit, loan type and property.

When fixed-rate averages climb, one question shows up more often: should I look at an adjustable-rate mortgage instead? This post explains how ARMs work, what the latest national data shows, and what to ask before you decide.

What the latest data shows

The Mortgage Bankers Association's weekly survey, released September 23, 2026, put the average contract rate for a 30-year conforming fixed loan at 7.12% for the week ending September 18. MBA Chief Economist Mike Fratantoni said rates "vaulted higher last week," calling it the highest level since May 2024.

The same MBA survey reported an average contract rate of 6.10% on 5/1 ARMs, and the ARM share of all applications rose to 9.8%. Those are national survey averages, not offers, and they are only a snapshot of one week.

In plain terms: some borrowers nationally are giving ARMs a second look while fixed-rate averages sit near 7%.

How an adjustable-rate mortgage works

An ARM starts with a fixed period. On a 5/1 ARM, for example, the rate is fixed for the first five years and then can adjust once a year after that. When the fixed period ends, your new rate is set by a formula.

The Consumer Financial Protection Bureau (CFPB) breaks that formula into two parts in its Ask CFPB explainer on ARM index and margin:

• The index is a market rate that moves with general economic conditions. It has nothing to do with your personal finances.
• The margin is the number of percentage points the lender adds to the index. It is written into your loan agreement and does not change after closing.

Index plus margin equals your adjusted rate, subject to the loan's caps. The CFPB notes that margins "can vary a lot between different lenders," so the margin is worth comparing, not just the starting rate.

The three caps to understand

Caps limit how far your rate can move. According to the CFPB's Ask CFPB explainer on ARM rate caps:

• Initial adjustment cap: how much the rate can change the first time it adjusts. Two or five percentage points is common.
• Subsequent adjustment cap: how much it can change at each adjustment after that. One to two percentage points is typical.
• Lifetime cap: how much it can change in total over the life of the loan. Five percentage points is the most common, though some loans are higher.

Two loans can have the same starting rate and very different cap structures. The CFPB recommends asking a lender to show your highest possible payment, which should also appear on your Loan Estimate.

Why this matters for Kern County borrowers

The California Association of Realtors reported a Kern County median sales price of $400,500 in August 2026, down 3.5% from a year earlier, with sales down 17.2% year over year (C.A.R., September 16, 2026). A slower market can give buyers more time to compare loan structures instead of rushing into one.

An ARM is not automatically better or worse than a fixed-rate loan. It moves risk around. With a fixed-rate loan, the rate you close with stays the same for the full term. With an ARM, you accept the chance of a higher rate later in exchange for the initial rate structure. Whether that trade makes sense depends on how long you plan to keep the home and the loan, how much room your budget has if the rate adjusts upward, and whether you are counting on a future refinance. Refinancing is never guaranteed. It depends on future rates, your credit, your income and your home's value at that time.

Local examples of where the question comes up:

• A buyer who expects to relocate for work within a few years may weigh an ARM's fixed period against their timeline.
• A household that wants a predictable housing cost for decades may prefer the certainty of a fixed rate, even at a higher average.
• Anyone considering an ARM should stress-test the budget at the lifetime cap, not just the starting rate.

Questions to ask before choosing

1. How long is the fixed period, and how often does the rate adjust after it ends?
2. Which index is used, and what is the margin?
3. What are the initial, subsequent and lifetime caps, and is there a floor?
4. What is the highest possible payment under the loan terms?
5. How would my budget handle that payment if I could not refinance?

Key takeaways

• Freddie Mac's 30-year fixed average was 7.03% the week of September 24, 2026, a national average, not a quote.
• MBA data for the week ending September 18 showed ARMs at 9.8% of applications, up from the prior week.
• An ARM's future rate is the index plus the margin, limited by caps. Compare all three, not just the starting rate.
• Plan around the worst case the loan allows, and don't count on refinancing later.
• The right structure depends on your timeline and budget. Everyone's situation is different.

Questions about your loan options? Contact us