The Korean Won (KRW) weakened significantly against the US Dollar (USD) on March 13, 2026, as the KRW/USD exchange rate settled at 0.000670378. This represented a substantial -0.728% daily drop, indicating that it now takes more KRW to purchase one USD, or conversely, one USD buys more KRW, reflecting a stronger USD and a weaker KRW for the day.

The primary force behind this movement was clearly the USD, which accounted for an 84% attribution to the day's decline, with the KRW contributing only 16%. This suggests that USD-specific factors, perhaps related to unexpected changes in US interest rate differentials or strong domestic economic data influencing Federal Reserve monetary policy expectations, were the dominant drivers.

Analyzing the mid-to-long-term picture, the KRW has been on a depreciating path against the USD. Over the past 6 months, the pair has fallen by -6.69%, and over the past year, it has fallen by -2.34%. The intraday volatility (Standard Deviation) has remained relatively steady, hovering around 0.60% for the week and 0.55% for the 6-month period, suggesting consistent, though not extreme, daily price fluctuations. However, the Efficiency (Choppiness) metric is very low across all periods (0.18 for 1 week, 0.13 for 6 months, and 0.02 for 1 year). A value close to 0.0 indicates that the market has been highly choppy or directionless over the long term, characterized by sharp zigzags rather than a clean, straight-line trend, despite the net negative change in the rate.

For concrete context, recent analysis of South Korean economic indicators, such as the latest inflation figures or the Bank of Korea's policy statements regarding domestic growth pressures, would be key to understanding the local pressure on the KRW. Simultaneously, any fresh commentary from the US central bank regarding future inflation targets or upcoming changes in monetary policy would illuminate the strong USD pull observed today. The market appears to be reacting more to external or USD-centric forces than to a stable, underlying trend in the KRW/USD relationship.