Today's mortgage refinance rates remained steady, with a 6.72% average rate for a 30-year fixed-rate mortgage.For a 20-year financed mortgage, the rate averaged 6.45%, while a 15-year financed mortgage averaged 5.64%.The APR for a 30-year fixed-rate mortgage refinance is 6.75%.Borrowers with a 30-year refinance mortgage of $100,000 at 6.72% would pay around $646 per month in principal and interest.On a 20-year fixed mortgage refinance, the average rate is 6.45%, with an APR of 6.49%.A $100,000 20-year fixed-rate refinance would cost $743 monthly in principal and interest.The 15-year fixed mortgage refinance averaged 5.64% with an APR of 5.7%.Borrowers with a 15-year refinance would pay about $825 monthly in principal and interest for a $100,000 loan.Refinance rates are typically higher than purchase loan rates by 0.01% to 0.15% for a 30-year fixed rate.Consider factors like closing costs and loan terms when deciding whether to refinance to potentially lower your monthly payments.