The average 30-year fixed mortgage interest rate rose 9 basis points to 6.64% on Wednesday, August 26, 2026, according to NerdWallet’s daily survey. The increase marks another climb in a month when mortgage rates have remained elevated above 6.60% for much of the period, pushing borrowing costs closer to their highest levels in over a year.
The rise reflects the tight link between mortgage rates and 10-year Treasury yields, which stood at approximately 4.64% to 4.70% as of August 26. When 10-year Treasury yields climb, mortgage rates typically follow in tandem, since lenders use Treasury yields as a benchmark for pricing long-term fixed loans.
Treasury yields have been climbing since July due to geopolitical tensions and their impact on inflation expectations. The conflict in Iran has driven oil prices sharply higher, raising concerns about persistent inflation that could keep the Federal Reserve cautious about cutting interest rates. According to NBC News reporting from late July, the Iran war has cost the average U.S. household over $1,200 as gas and grocery prices have risen alongside mortgage rates. As CNBC reported on August 18, the 10-year Treasury yield climbed above 4.7%, compared to below 4% earlier in the year, directly pressuring mortgage rates upward.
The current rate environment represents a significant shift from earlier in 2026. According to U.S. Bank data, the 30-year fixed mortgage rate fell to 5.98% on February 26, 2026, then climbed to 6.65% by August 20. The mortgage industry is now bracing for rates to remain elevated through the remainder of the year. Mortgage rates have held near 13-month highs at 6.65%-6.77% over recent days, and Fannie Mae has raised its mortgage forecast to 6.8% through mid-2027, signaling that lenders expect borrowing costs to remain challenging for homebuyers in the near term.
Housing economists have adjusted their expectations accordingly. According to Bankrate’s August 5 analysis, housing economists no longer expect mortgage rates to fall below 6% in the near future, a reality that is affecting home sales. The Mortgage Bankers Association predicts in its latest forecast that 30-year mortgage rates will average 6.5% through 2026, 2027, and 2028. The Federal Reserve does not directly set mortgage rates, but its policy decisions influence the broader interest rate environment that determines borrowing costs for homebuyers. The 30-year mortgage rate has climbed as housing costs rise, narrowing affordability for prospective buyers.
Sources
- NerdWallet — confirmed 30-year fixed mortgage rate rose 9 basis points to 6.64% on August 26, 2026
- Wall Street Journal — reported mortgage rates hovering above 6.60% for much of August 2026
- CNBC — documented 10-year Treasury yield above 4.7% and its direct relationship to mortgage rates
- NBC News — reported Iran war’s impact on oil prices, inflation, and household costs in late July 2026
- U.S. Bank — provided historical mortgage rate data showing decline from 5.98% in February to 6.65% by August 20
- Bankrate — reported housing economists’ revised expectations that rates will not fall below 6% near-term
- Fannie Mae — issued forecast predicting 30-year rates will average 6.8% through mid-2027
- Mortgage Bankers Association — predicted 30-year rates will average 6.5% in 2026, 2027, and 2028
- Trading Economics / MarketWatch — provided 10-year Treasury yield data at 4.64%-4.70% as of August 26, 2026
