The 30-year fixed-rate mortgage averaged 3.55% for the week ending March 15, according to Zillow Mortgages. That was two basis points higher than the week ending March 8.
The average rose early in the week, after which it hovered around the current rate for the remainder of the week.
"Mortgage rates increased last week on news of further stimulus from the European Central Bank and talk of an agreement to limit oil output," Erin Lantz, Zillow's vice president of mortgages, said in a press release.
"This week, any major rate movements will depend on the Fed's Wednesday statement and any signals for the path of interest rates ahead."
The 15-year fixed-rate mortgage is currently 2.73%, while the rate for a 5/1 adjustable-rate mortgage is 2.9%.