Mortgage rates inched up again this week, as the average 30-year fixed mortgage rose to 6.32 percent, Bankrate.com said. The 15-year fixed rate mortgages rose to 6.05 percent. The average 5/1 adjustable rate mortgage climbed to 6.24 percent. Still, rates now are lower than those seen last summer when the Fed raised interest rates and average 30-year fixed rates hit 6.93 percent.