Mortgage Rates Fall September 5, 2026: 30-Year at 6.67%, ARM Slides 39 Basis Points

The Quick Take

• The 30-year fixed mortgage rate fell 4 basis points to 6.67% on September 5, 2026, as rates declined broadly
• The 15-year fixed rate dropped 10 basis points to 6.04% while the 5/1 ARM fell a sharp 39 basis points to 6.64%
• Broad rate rollback across loan types signals improving affordability conditions for home buyers and refinance candidates

Synthesized from 1 source — full coverage, sentiment breakdown, and forward signals below.

Mortgage rates moved broadly lower on Saturday, September 5, 2026, with declines registered across fixed and adjustable-rate loan categories. The benchmark 30-year fixed mortgage rate fell 4 basis points to 6.67%, extending a recent trend of modest rate improvement that has begun to ease affordability pressure for prospective home buyers. The 15-year fixed rate, popular for refinances and shorter-horizon buyers, declined a steeper 10 basis points to 6.04%, widening the spread between the two benchmark products and making the shorter-duration option increasingly attractive for borrowers who qualify for the higher monthly payment.

The most significant move on September 5 came in the 5/1 adjustable-rate mortgage category, which fell 39 basis points to 6.64%. ARM volatility has been a persistent theme as the market prices in shifting Federal Reserve rate expectations and adjusts the short-duration risk premium embedded in adjustable products. The 39-basis-point decline brings the 5/1 ARM close to parity with the 30-year fixed rate—an unusual convergence that historically signals either a near-term rate rally expectation or temporary dislocations in the funding markets that underpin ARM product pricing, making the fixed-versus-adjustable choice particularly consequential for borrowers today.

The broad-based rate rollback on September 5 provides a modest affordability tailwind for the housing market, which has been grappling with the combination of elevated rates and resilient home prices that have compressed purchasing power for many buyers. Refinance candidates who locked rates at higher levels may find the current environment approaching breakeven thresholds for refinancing economics, particularly those with rate locks at 7% or above from the peak rate environment. While a single day's movement is not indicative of a sustained trend, the broad direction of decline across all major loan categories suggests continued easing in mortgage financing conditions heading into the fall homebuying season.