After six weeks of increases, mortgage interest rates dipped this week, according to several weekly surveys. Freddie Mac's Primary Mortgage Market Survey shows that the 30-year fixed-rate mortgage (FRM) averaged 3.93 percent (with 0.8 point) for the week ending June 20.

That's down ever-so-slightly from 3.98 percent the week before. Looking for a shorter term? The 15-year FRM averaged 3.04 percent (with 0.7 point), down from 3.10 percent the prior week.