The 30-year, fixed mortgage rate inched up last week to 4.27% from its nadir of 4.26% the week prior, according to the Zillow Mortgage Marketplace weekly update. The national average rate fell steadily through August. Zillow said the current 15-year, fixed average rate is 3.8% and the rate for a 5-1 adjustable rate mortgage is 3.21%. That type of mortgage maintains a steady rate for five years and then is adjusted annually thereafter. Weekly changes varied regionally, as many states saw a decrease in rates but some of the most-populous states experienced increases. Rates in New Jersey rose to 4.36% from 4.19% the previous week, New York’s average rate was 4.35% last week, up from 4.24%, and Texas saw its average rate climb to 4.29% from 4.23%. Meanwhile California’s current rate of 4.26% is down from 4.28% last week and 4.3% the week prior. Pennsylvania’s average rate for a 30-year fixed mortgage fell to 4.31% from 4.37% at Aug. 31. Zillow bases its averages on real-time mortgage quotes from lenders registered with the company. The national average comes from thousands of daily quotes by anonymous borrowers through the Seattle-based company’s website. Write to Jason Philyaw. Disclosure: The author holds no relevant investments.