The average interest rate on a 30-year fixed mortgage is 7.08%, down from 7.22% a week ago.The average rate on a 15-year fixed mortgage is 6.25%, a decrease of 0.08 percentage point from the previous week.Homeowners considering refinancing should compare current mortgage rates with their existing rate to determine if it's worth refinancing.The current average interest rate on a 30-year fixed-rate jumbo mortgage is 7.15%, down 0.11 percentage point from last week.