After a series of ups and downs last week, mortgage rates are currently stable.

The average interest rate on a 30-year, fixed-rate mortgage remains flat at 7.20% APR, according to rates provided to NerdWallet by Zillow. This is unchanged from yesterday and four basis points lower than a week ago. (See our chart below for more specifics.) A basis point is one one-hundredth of a percentage point.

The Federal Reserve's two-day meeting starts today, with a rate announcement expected tomorrow. If the committee votes to raise the federal funds rate (which it's not expected to do), mortgage rates will likely go up, since lenders didn't adjust their offers beforehand. If the Fed votes to hold rates steady (which is expected), rates could remain flat until economic news shakes things up again.

That could happen as early as Thursday, when the Bureau of Economic Analysis is scheduled to release September inflation data.…