South Korea's consumer inflation is likely to stay in the 5-6 percent range for a considerable period of time amid high energy and food prices and the local currency's sharp weakness against the US dollar, the chief of the country's central bank said Monday.

Asia's fourth-largest economy is expected to see slowing growth momentum into next year due to China's slowdown and heightened external conditions, Bank of Korea Gov. Rhee Chang-yong told a parliamentary committee meeting.

"Consumer prices are expected to extend their upward growth of 5-6 percent for a considerable period of time," Rhee said.

South Korea's consumer prices grew at a slower pace in August after running at a 24-year high the previous month as global oil prices retreated. But the country still faces high inflationary pressure due largely to an increase in energy and food prices.

Consumer prices, a key gauge of inflation, jumped 5.7 percent on-year last month, slowing from a 6.3 percent surge in July.

The won's sharp weakness is feared to further add upward pressure on consumer inflation.

The Korean currency on Monday fell below the 1,420 won mark against the US dollar for the first time in more than 13 years during intraday trading amid global tightening.

Rhee said the BOK plans to "actively" take measures to stabilize the foreign exchange market if there is excessive herd behavior in the market.

He said the country was expected to continue to post a current account surplus this and next year despite heightened external conditions.

South Korea's exports have shown signs of weakening due to slowing global demand. The nation is poised to log a trade deficit for the sixth straight month in September for the first time in about 25 years.

A trade deficit is feared to put downward pressure on the Korean won as it means fewer dollars in the market. (Yonhap)