Korean Won Weakens as Oil Shock and Fed Rate Bets Hit Seoul Markets

The South Korean won weakened against the U.S. dollar on Monday as rising oil prices, expectations of tighter U.S. monetary policy and heavy foreign selling placed pressure on Korean financial markets.

The currency was quoted at 1,347.3 won per dollar at 3:30 p.m., down 1.4 won from the previous stock-market session’s close, Yonhap News Agency reported at 4:25 p.m. Korea time on September 14.

The move came as Brent crude futures hovered above $100 a barrel amid an escalating military conflict between the United States and Iran. The rise in energy prices added to inflation concerns and strengthened market expectations that the U.S. Federal Reserve could raise interest rates this week.

For South Korea, the combination is particularly uncomfortable. A weaker won makes imported energy more expensive in local-currency terms, while higher global interest rates can increase the attraction of dollar assets. Together, those forces can add pressure to domestic prices and financial conditions.

Investors were also watching the Bank of Japan’s policy decision later in the week, adding another source of uncertainty for Asian currency markets.

Pressure was more severe in Seoul’s equity market. Foreign investors sold a net 3.2 trillion won, equivalent to approximately $2.3 billion, during the latest session. The benchmark KOSPI fell 3.26 percent to close at 6,684.37.

The simultaneous decline in the won and Korean equities signals a broad reduction in risk appetite rather than an isolated currency move. Foreign stock sales can generate additional demand for dollars when overseas investors convert proceeds from won-denominated assets, potentially reinforcing pressure on the exchange rate.

The immediate focus now turns to central-bank signals and energy markets. If crude prices remain elevated, investors may continue to worry that inflation will stay persistent and limit the room for monetary easing. A more hawkish Federal Reserve decision could further support the dollar, while any easing in geopolitical tension or energy prices could help stabilize sentiment.

For Korean businesses, the effects will differ by sector. Energy importers and companies with significant dollar-denominated costs face higher expenses when the won weakens. Exporters receiving dollar revenue may gain some currency support, although weaker global risk sentiment and volatile equity markets can offset that benefit.

Monday’s moves underline how quickly external shocks can reach Korea’s markets through oil, interest-rate expectations and cross-border capital flows. The won’s direction will now depend not only on the Federal Reserve’s decision, but also on whether the oil shock proves temporary and whether foreign investors return to Korean equities.