Today's mortgage refinance rates have climbed, with the 30-year fixed refinance rate at 6.84%, 15-year fixed rate at 5.78%, and 20-year rate at 6.61%.The average rate for a 30-year fixed-rate mortgage refinance is 6.84%, resulting in a monthly payment of $654 for a $100,000 loan.The total interest cost over the life of the loan for a 30-year fixed-rate mortgage refinance would be around $135,557.The APR for a 30-year fixed-rate mortgage is 6.87%, reflecting the all-in cost of the loan.Refinance rates for 20-year mortgages are at 6.61% with an APR of 6.66%.For a 20-year fixed-rate mortgage refinance of $100,000, the monthly cost would be $752 in principal and interest.15-year fixed mortgage refinance rates are around 5.78% with an APR of 5.83%.A 15-year fixed-rate mortgage refinance of $100,000 would result in a monthly payment of $832.Jumbo mortgage refinance rates are higher, with the 30-year fixed-rate at 7.21% and 15-year fixed-rate at 6.23%.Consider refinancing for reasons like lowering interest rates, paying down the mortgage sooner, accessing home equity, or eliminating PMI.