"The trade deficit widened by a great degree in August due to high crude oil and commodity prices, but the current account is expected to post about $30 billion surplus," Yoon explained.

The comment came as the South Korean won hit the weakest level since April 2009 at 1,357.2 per dollar, having fallen more than 12% so far this year.

(Reporting by Soo-hyang Choi and Jihoon Lee; Editing by Shri Navaratnam and Himani Sarkar)