Freddie Mac 30-Year Fixed Rate Mortgage Rates Rises To 3.55% August 3, 2012 George Duarte Mortgage Rates Comments Off on Freddie Mac 30-Year Fixed Rate Mortgage Rates Rises To 3.55% This week, for the first time since mid-June, the 30-year fixed rate mortgage rate climbed on a week-over-week basis, moving 6 basis points to 3.55%, on average.