ASSETCASTING

Which way did USD/KRW move in month 9?

won per 1 dollar · First valid observation → last valid observation in month 9 · Since 2007

Total 20 · Completed 20 · Ongoing 0 · Excluded 0

Last observed 2026-09-01 · Updated 2026-10-09

Positive / completed cases9 / 20Negative 11 · Flat 0
Return Median-0.9%Mean +0.5%
Completed outcome range-5.6% ~ +11.3%Minimum ~ maximum

Same conditions, different outcomes

Positive and negative outcomes are compared against 0%. Ongoing and excluded cases are not included in the statistics. Open a case to explore its context.

2026.09.01 · 2026, month 9Completed · 2026-09-01-1.2%

Observed 2026-09-01 → 2026-09-30 · As of 2026-10-02

Starting observation
2026-09-01 · 1,371.76 KRW/USD
Ending observation
2026-09-30 · 1,355.91 KRW/USD
Calendar window
2026, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,371.76 to 1,355.91, a spot-quote change of -1.1554%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2025.09.02 · 2025, month 9Completed · 2025-09-02+0.7%

Observed 2025-09-02 → 2025-09-30 · As of 2026-10-02

Starting observation
2025-09-02 · 1,394.76 KRW/USD
Ending observation
2025-09-30 · 1,404.63 KRW/USD
Calendar window
2025, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,394.76 to 1,404.63, a spot-quote change of 0.7076%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2024.09.03 · 2024, month 9Completed · 2024-09-03-1.9%

Observed 2024-09-03 → 2024-09-30 · As of 2026-10-02

Starting observation
2024-09-03 · 1,339.79 KRW/USD
Ending observation
2024-09-30 · 1,314.94 KRW/USD
Calendar window
2024, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,339.79 to 1,314.94, a spot-quote change of -1.8548%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2023.09.01 · 2023, month 9Completed · 2023-09-01+2.2%

Observed 2023-09-01 → 2023-09-29 · As of 2026-10-02

Starting observation
2023-09-01 · 1,318.34 KRW/USD
Ending observation
2023-09-29 · 1,347.86 KRW/USD
Calendar window
2023, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,318.34 to 1,347.86, a spot-quote change of 2.2392%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2022.09.01 · 2022, month 9Completed · 2022-09-01+5.7%

Observed 2022-09-01 → 2022-09-30 · As of 2026-10-02

Starting observation
2022-09-01 · 1,354.34 KRW/USD
Ending observation
2022-09-30 · 1,431.67 KRW/USD
Calendar window
2022, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,354.34 to 1,431.67, a spot-quote change of 5.7098%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2021.09.01 · 2021, month 9Completed · 2021-09-01+2.4%

Observed 2021-09-01 → 2021-09-30 · As of 2026-10-02

Starting observation
2021-09-01 · 1,156.03 KRW/USD
Ending observation
2021-09-30 · 1,183.7 KRW/USD
Calendar window
2021, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,156.03 to 1,183.7, a spot-quote change of 2.3935%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2020.09.01 · 2020, month 9Completed · 2020-09-01-1.4%

Observed 2020-09-01 → 2020-09-30 · As of 2026-10-02

Starting observation
2020-09-01 · 1,182.94 KRW/USD
Ending observation
2020-09-30 · 1,165.97 KRW/USD
Calendar window
2020, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,182.94 to 1,165.97, a spot-quote change of -1.4346%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2019.09.03 · 2019, month 9Completed · 2019-09-03-1.4%

Observed 2019-09-03 → 2019-09-30 · As of 2026-10-02

Starting observation
2019-09-03 · 1,212.44 KRW/USD
Ending observation
2019-09-30 · 1,195.85 KRW/USD
Calendar window
2019, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,212.44 to 1,195.85, a spot-quote change of -1.3683%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2018.09.04 · 2018, month 9Completed · 2018-09-04-0.7%

Observed 2018-09-04 → 2018-09-28 · As of 2026-10-02

Starting observation
2018-09-04 · 1,117.5 KRW/USD
Ending observation
2018-09-28 · 1,109.76 KRW/USD
Calendar window
2018, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,117.5 to 1,109.76, a spot-quote change of -0.6926%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2017.09.01 · 2017, month 9Completed · 2017-09-01+2.1%

Observed 2017-09-01 → 2017-09-29 · As of 2026-10-02

Starting observation
2017-09-01 · 1,119.12 KRW/USD
Ending observation
2017-09-29 · 1,142.57 KRW/USD
Calendar window
2017, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,119.12 to 1,142.57, a spot-quote change of 2.0954%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2016.09.01 · 2016, month 9Completed · 2016-09-01-1.7%

Observed 2016-09-01 → 2016-09-30 · As of 2026-10-02

Starting observation
2016-09-01 · 1,116.89 KRW/USD
Ending observation
2016-09-30 · 1,097.98 KRW/USD
Calendar window
2016, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,116.89 to 1,097.98, a spot-quote change of -1.6931%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2015.09.01 · 2015, month 9Completed · 2015-09-01+0.4%

Observed 2015-09-01 → 2015-09-30 · As of 2026-10-02

Starting observation
2015-09-01 · 1,179.78 KRW/USD
Ending observation
2015-09-30 · 1,184.62 KRW/USD
Calendar window
2015, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,179.78 to 1,184.62, a spot-quote change of 0.4102%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2014.09.02 · 2014, month 9Completed · 2014-09-02+3.6%

Observed 2014-09-02 → 2014-09-30 · As of 2026-10-02

Starting observation
2014-09-02 · 1,018.2 KRW/USD
Ending observation
2014-09-30 · 1,054.55 KRW/USD
Calendar window
2014, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,018.2 to 1,054.55, a spot-quote change of 3.57%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2013.09.03 · 2013, month 9Completed · 2013-09-03-2.2%

Observed 2013-09-03 → 2013-09-30 · As of 2026-10-02

Starting observation
2013-09-03 · 1,097.75 KRW/USD
Ending observation
2013-09-30 · 1,073.33 KRW/USD
Calendar window
2013, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,097.75 to 1,073.33, a spot-quote change of -2.2246%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2012.09.04 · 2012, month 9Completed · 2012-09-04-1.9%

Observed 2012-09-04 → 2012-09-28 · As of 2026-10-02

Starting observation
2012-09-04 · 1,133.23 KRW/USD
Ending observation
2012-09-28 · 1,111.21 KRW/USD
Calendar window
2012, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,133.23 to 1,111.21, a spot-quote change of -1.9431%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2011.09.01 · 2011, month 9Completed · 2011-09-01+11.3%

Observed 2011-09-01 → 2011-09-30 · As of 2026-10-02

Starting observation
2011-09-01 · 1,061.4 KRW/USD
Ending observation
2011-09-30 · 1,180.9 KRW/USD
Calendar window
2011, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,061.4 to 1,180.9, a spot-quote change of 11.2587%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2010.09.01 · 2010, month 9Completed · 2010-09-01-3.7%

Observed 2010-09-01 → 2010-09-30 · As of 2026-10-02

Starting observation
2010-09-01 · 1,184 KRW/USD
Ending observation
2010-09-30 · 1,140.1 KRW/USD
Calendar window
2010, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,184 to 1,140.1, a spot-quote change of -3.7078%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2009.09.01 · 2009, month 9Completed · 2009-09-01-5.6%

Observed 2009-09-01 → 2009-09-30 · As of 2026-10-02

Starting observation
2009-09-01 · 1,245 KRW/USD
Ending observation
2009-09-30 · 1,175 KRW/USD
Calendar window
2009, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,245 to 1,175, a spot-quote change of -5.6225%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2008.09.02 · 2008, month 9Completed · 2008-09-02+6.3%

Observed 2008-09-02 → 2008-09-30 · As of 2026-10-02

Starting observation
2008-09-02 · 1,134.45 KRW/USD
Ending observation
2008-09-30 · 1,206.3 KRW/USD
Calendar window
2008, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 1,134.45 to 1,206.3, a spot-quote change of 6.3335%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

2007.09.03 · 2007, month 9Completed · 2007-09-03-2.6%

Observed 2007-09-03 → 2007-09-28 · As of 2026-10-02

Starting observation
2007-09-03 · 938.1 KRW/USD
Ending observation
2007-09-28 · 913.6 KRW/USD
Calendar window
2007, month 9 · First valid observation → last valid observation in that window

The observed won per 1 dollar changed from 938.1 to 913.6, a spot-quote change of -2.6117%. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. This is not an investment return incorporating interest-rate differentials, carry and transaction costs, and the condition is not established as the cause of the change.

How to interpret this

These descriptive statistics compare how direction and magnitude differed across observed cases under the same condition. Positive values indicate dollar strength and won weakness; negative values indicate dollar weakness and won strength. A particular season or a past sharp move cannot be assumed to determine subsequent exchange rates. No comparison with unconditional changes over the full period or separate validation sample was performed, so no outperformance is claimed.

These are changes in spot exchange-rate or dollar-index quotes, not investment returns including dividends, interest, carry, transaction costs and foreign-exchange spreads. Examining multiple conditions within the same sample can produce chance findings. Thresholds are not natural economic laws, and results differ with other criteria. Follow-up windows within the same pattern do not overlap, but statistical independence is not guaranteed and cases can overlap across patterns. Federal Reserve data are published after their observation dates and may be revised, so these results do not establish real-time tradability or predictive power.

Conditions, methodology and sources

Includes all annual calendar windows corresponding to month 9 between 2007-01-01~2026-10-02. The observation start date is the first valid observation in that window, and the end date is the last valid observation. These are therefore not monthly changes relative to the previous month-end or total returns for an entire quarter; they exclude the first observation day’s change relative to the preceding day. Cases whose calendar end date has not yet arrived are marked ongoing and excluded from means and medians. Source data are the Federal Reserve’s H.10 daily data. Missing status ND(-9999) is excluded without interpolation. Change is calculated as (ending observation / starting observation - 1) × 100 and stored to 8 decimal places. Quotes are won per 1 dollar, with positive values indicating dollar strength and won weakness; negative values indicate dollar weakness and won strength. Dates are source observation reference dates, not publication times or times when trading was possible. The source is revised data from the release of 2026-10-05, not a real-time investment-strategy backtest.