One Mortgage Index Read 7.07% on Thursday. Freddie Mac Read 6.76%. Both Were Describing the Same Week.

On Thursday 10 September 2026, three widely cited measures of the 30-year fixed mortgage rate disagreed by more than 30 basis points. Mortgage News Daily put it at 7.07%. Zillow put it at 7.002%. Freddie Mac weekly survey, released the same morning, put it at 6.76%.

None of them is wrong. They are measuring different things over different windows, and in a week when rates move quickly the difference between those windows becomes larger than the difference between lenders.

What each number is doing

The daily indices reprice every business day. Mortgage News Daily own published series shows the path clearly: 6.89% on Tuesday 8 September, 6.97% on Wednesday, 7.07% on Thursday. That is an 18 basis point rise across two sessions, and UPI reported it as the first time the index has exceeded 7% since May 2025.

A weekly survey cannot show that. It reports a level for the week as a whole. If most of the move happens on Wednesday and Thursday, a weekly figure will sit below where the market closed on Thursday — not because the survey is stale in any culpable sense, but because an average of a rising series is lower than its final value. Freddie Mac reading moved from 6.71% to 6.76%, a five basis point change, over a week in which the daily series moved almost four times that.

For a borrower, the practical consequence is narrow but real. The number quoted in a Thursday headline based on the weekly survey is not the number a lender will quote that afternoon.

Why it moved

Matthew Graham, chief operating officer at Mortgage News Daily, attributed the move to the bond market.

It's been a rough couple of days for the bond market. Yesterday, it was [Treasury Secretary] Bessent and the reaction to the Treasury buyback announcement. Today it is an overnight surge in oil prices.

Yahoo Finance reported the 10-year Treasury yield rose 8 basis points on Thursday to more than 4.9%, described as a multi-year high. Mortgage rates are priced off longer-dated Treasury yields and mortgage-backed securities spreads rather than off the federal funds rate, which is why they can move sharply in a week with no central bank meeting in it.

Demand was already falling before the break

The Mortgage Bankers Association weekly applications survey, released on 9 September and covering the week ending 4 September, showed the market composite index down 2.7% on a seasonally adjusted basis. The detail underneath:

• Refinance index: down 6% on the week and 25% on the year
• Purchase index: down 0.2% seasonally adjusted on the week
• 30-year fixed contract rate: 6.85%, described as the highest since June 2025
• Refinance share of applications: 40.9%
• Adjustable-rate share: 8.5%, the highest since June
• FHA share: 17.2%, up from 15.9%. VA share: 12.0%, down from 13.6%
• 15-year fixed: 6.17%. 5/1 ARM: 5.82%

The rising adjustable-rate and FHA shares are the usual signature of an affordability squeeze. When the fixed rate gets uncomfortable, some borrowers move to products with a lower initial payment or a lower down payment requirement rather than leaving the market.

Mortgage rates moved higher last week, driven by ongoing investor concerns over inflation and the federal budget deficit.

Credit tightened at the same time

The MBA Mortgage Credit Availability Index fell 1% in August to 107.3, having reached a four-year high in July. The conventional index fell 1.8% and the jumbo index 2.5%; the government and conforming indices were unchanged. A lower reading means credit is harder to obtain.

Credit availability decreased in August, as lenders reduced their offerings of loan programs that require flexible documentation, along with cash-out refinance loans.

Cash-out refinancing is the product most sensitive to this combination. It requires both a rate a borrower will accept and a lender willing to write it, and in August both moved the wrong way.