Mortgage rates moved higher on Wednesday, August 12, 2026, with the average 30-year fixed loan rising to 6.65%, up 6 basis points from Tuesday. The average 15-year fixed mortgage rate also climbed, reaching 6.00% after a 3-basis-point increase.
That shift matters because homebuyers and refinance shoppers use these national averages as a quick read on borrowing costs, and the move came even as the 5/1 ARM edged down to 6.51%, 1 basis point lower than Tuesday. Zillow lender marketplace data rounded the figures to the nearest hundredth, which means the day’s changes were small but still enough to move the most watched loan types in opposite directions.
The 30-year fixed loan remains the workhorse for buyers because it spreads payments over a longer term and usually keeps monthly bills lower than a shorter mortgage, while the 15-year fixed loan generally carries a lower rate but demands a higher monthly payment. That is why a rise of just a few basis points can still change how much room a buyer has in the budget, especially for anyone comparing this week’s numbers with the update in Mortgage Loan Rates Today: 30-Year Rate Jumps to 6.66% or looking back at Finance climbs as 30-year mortgage rate hits 6.58% on inflation fears.
The split between fixed loans and the 5/1 ARM also shows that mortgage pricing is not moving in one clean line. Fixed rates were higher on Wednesday, but the ARM slipped, which points to different pricing pressures across loan types rather than a broad, uniform jump. Mortgage refinance rates are often higher than the rates offered when buying a house, although that is not always the case, so shoppers comparing options may find the gap changes from one day to the next.
For readers tracking the market day by day, the immediate takeaway is plain: the latest national average mortgage costs rose for the main fixed loans on Wednesday, while one adjustable option eased slightly. The next update will show whether that divergence was a one-day wrinkle or the start of a broader turn in borrowing costs.
