Mortgage rates moved in opposite directions on May 31, 2026, with the average 30-year fixed loan edging down to 6.33% while the 5/1 ARM jumped to 6.45%. The 15-year fixed held steady at 5.79%.
That split matters because buyers and homeowners shopping for a new loan or a refinance are watching every small move in borrowing costs. The numbers are national averages from the Zillow lender marketplace, rounded to the nearest hundredth, and they can shape what a monthly payment looks like before a borrower ever signs a contract.
The 30-year rate fell by 3 basis points, a small move on its own but enough to keep the benchmark fixed-rate loan near the center of the housing finance debate. A 30-year mortgage spreads payments over 360 months, which is why even modest changes in rates can alter both affordability and the total cost of borrowing.
For a $300,000 mortgage, a 30-year term at 6.41% would produce a monthly principal and interest payment of about $1,878.48 and roughly $376,254 in interest over the life of the loan. The same loan amount on a 15-year term at 5.80% would mean a monthly payment of $2,499.27 but total interest of $149,869, underscoring the tradeoff between lower monthly bills and lower long-run cost.
The sharper move came in the ARM market. The 5/1 ARM rose 24 basis points in a single day, and those rates have shown significant daily volatility over the last few weeks. That makes them harder for borrowers to read from one day to the next, especially when the fixed-rate side of the market is moving much more gradually.
A fixed-rate mortgage keeps the rate locked in for the entire life of the loan, while a borrower gets a new rate if they refinance. That is one reason refinance borrowers tend to watch rates so closely, even though refinance pricing is often higher than the rate offered when buying a house, though not always. Recent moves above 6% in the broader mortgage market have kept that comparison front and center, alongside the separate climb in Treasury yields that has pushed rates higher in other sessions.
For now, the clearest takeaway is that the average 30-year mortgage rate today is 6.33%, the 15-year fixed is 5.79%, and the ARM market is still the most unsettled corner of the table. The next move is not locked in, but the day’s pricing shows how quickly the balance can shift between stability and volatility.
