The average 30-year mortgage rate climbed to 5.89%, the highest level since 2008, according to new data published Thursday by Freddie Mac.

The increase comes after a period this summer that saw mortgage rates briefly decline even as the Federal Reserve raises the key interest rate to fight inflation. Markets have been closely watching the Fed's moves since the interest rate hikes began in March.

"Rates are reacting to Federal Reserve Chair Jay Powell’s comments following last week’s jobs report in which he reiterated his unwavering focus on bringing inflation down to its 2% target level," said Lisa Sturtevant, chief economist at Bright MLS, a real estate data firm, in an email.

In remarks Thursday morning, Powell signaled the Fed intends to keep rates higher for longer.

“History cautions strongly against prematurely loosening policy,” the central bank leader said in a Q&A presented by the Cato Institute, a libertarian think-tank based in Washington, D.C, according to CNBC. “I can assure you that my colleagues and I are strongly committed to this project and we will keep at it until the job is done.”

Mortgage rates tend to track U.S. government bond yields. This week, the yield on the 10-year Treasury note jumped as high as 3.35%, itself the highest level in more than a decade.

The higher mortgage rates are already weighing on home prices. For the first time in nearly 18 months, the average U.S. home sold below its asking price, according to housing group Redfin. The median home sale price was $370,000, up 6% year-over-year but 6% below the record high of $393,725 hit during the four-week period ending June 19, Redfin said.

Even as mortgage rates tick higher, home shoppers should be able to easily find a rate lower than the average, Freddie Mac said.