mortgage rates rose again in the latest week exceeding 45 according to housingfinance agency freddie mac in the week ending thursday the average rate on a 30year fixedrate mortgage rose to 467 from 442 last week a year ago this week the average rate was 318 average 15year rates were 383 up from 363 a week ago and 245 a year ago the average rate on a fiveyear treasuryindexed hybrid adjustablerate mortgage or arm was 35 up from 336 last week a year ago the fiveyear arm averaged 284 mortgage rates continued moving upward in the face of rising inflation and the prospect of demand for goods amid ongoing supply disruptions freddie mac chief economist sam khater said purchase demand has weakened modestly but has continued to outpace expectations this is largely due to unmet demand from firsttime homebuyers as well as a select few who had been waiting for rates to hit a cyclical low he said write to will feuer at willfeuerwsjcom