The won-dollar exchange rate is displayed at a dealing room in Hana Bank in Seoul, Monday. Yonhap

The Korean won weakened against the U.S. dollar Tuesday amid renewed expectations that the U.S. Federal Reserve would raise its rates this year.

The won opened at 1,539.4 won per dollar, down 2.4 won from the previous session.

At one point in the morning trading, the won fell to as low as 1,540.1 won per dollar, marking the weakest level since June 8.

Last week, the U.S. Fed held its benchmark interest rate steady in its first rate decision since new Chair Kevin Warsh took office, but at least half of its policymakers anticipated a higher rate later this year.