Mortgage Rates in St Louis, MO According to the Economic and Strategic Report of Fannie Mae last December the market “has turned the corner and a sustained recovery is under way.” Experts are looking at an increase of 15% on mortgage originations while refinance volume is expected to fall 26%. St. Louis MORTGAGE INTEREST RATES for January 3, 2013: Conventional 30-Year Fixed 3.500%/ 3.777% APR Conventional 15-Year Fixed 3.000%/ 3.097% APR Conventional 7/1 ARM 2.625%/ 3.332% APR FHA/VA 30 Year Fixed 3.25%/4.160% APR Jumbo 5/1 ARM 2.625%/ 2.426% APR Jumbo 15 yr Fixed 3.000%/ 3.094% APR Jumbo 30 yr Fixed (0 comments)