The average mortgage rate on a 30-year fixed-rate mortgage is 6.72%, up 0.02 percentage point from the previous week.Borrowers can potentially save on interest costs by opting for a 15-year fixed mortgage, which has an average APR of 5.85%.The average refinance rate has increased, causing borrowers to pay more in interest on a 30-year mortgage, with the current rate at 6.72%.Today's average interest rate on a 30-year fixed-rate jumbo mortgage is 7.16%, while the rate for a 15-year fixed mortgage is 5.79%.