The Dollar Takes Control as the Yen Stumbles After a Historic BOJ Hike
September’s currency market has delivered another major reversal.
On September 1, the Japanese yen was flirting with 160 per U.S. dollar. By September 8, it had roared back toward 153. On September 15, USD/JPY returned toward 155.
Now, on September 22, the dollar has taken control again.
The U.S. Dollar Index climbed to roughly 100.5, its strongest level since late July, following the Federal Reserve’s first rate increase in more than three years. Meanwhile, something unusual happened in Japan: the Bank of Japan raised its policy rate to a 31-year high of 1.25%—and the yen weakened anyway. (Investing.com)
That may be the most important currency signal of the week.
💵 U.S. DOLLAR — THE SEPTEMBER COMEBACK CONTINUES
The dollar entered September with momentum, briefly stumbled during the yen rally, and has now re-established itself.
The Dollar Index reached approximately 100.54 on September 22, extending the rally following last week’s Federal Reserve decision. (Investing.com)
The Fed unanimously increased its target range from 3.50%–3.75% to 3.75%–4.00%. More importantly for currency traders, the Fed’s projections showed at least 12 policymakers expecting another increase during 2026, while Chair Kevin Warsh emphasized continuing inflation risks. (Investing.com)
That’s important because currencies trade on what’s coming next.
One rate increase can strengthen the dollar.
Expectations for multiple increases can potentially create a larger trend.
BuckBully Trend: USD — 📈 BULLISH
The dollar currently has interest-rate momentum behind it.
The next question is whether incoming inflation, employment and growth data justify the market’s increasingly hawkish expectations.
🇯🇵 JAPANESE YEN — RATE HIKE…AND IT STILL FALLS
This is September’s surprise story.
The Bank of Japan raised its policy rate by 25 basis points to:
1.25%
That’s the highest Japanese policy rate in roughly three decades. (Investing.com)
Normally, higher rates should provide support for a currency.
Instead, USD/JPY traded around:
157.5
on September 22. (Investing.com)
The yen had fallen more than 2% during the previous week despite the BOJ increase. (Investing.com)
Why?
Because currency markets don’t care only about whether rates rise.
They care about the difference between rates.
The Federal Reserve is tightening aggressively enough that U.S. yields remain considerably more attractive than Japanese yields.
Even after Japan’s historic increase, that gap remains substantial.
🚨 JAPAN INTERVENTION WATCH RETURNS
Here we go again.
The yen approaching the upper-157 area has brought intervention speculation back into the market.
Japanese authorities reportedly conducted a rate check around the time of the BOJ meeting—a move traders often interpret as a potential precursor to intervention. (Reuters)
That doesn’t mean intervention is guaranteed.
But traders remember what happened earlier this year.
And with USD/JPY once again moving toward 160, shorting the yen becomes increasingly dangerous because one government action could create an abrupt reversal.
USD/JPY levels to watch
157–158: Current battleground
160: Major psychological/intervention zone
155: First meaningful downside area
152–153: September rally territory
150: Major psychological support
BuckBully Trend: JPY — 📉 WEAK / HIGH REVERSAL RISK
The yen is technically under pressure.
But the closer USD/JPY moves toward 160, the greater the possibility of intervention-related volatility.
💣 THE YEN CARRY TRADE ISN’T DEAD YET
Earlier this month, it looked like the enormous yen carry trade could begin unwinding.
That risk hasn’t disappeared.
The strategy is straightforward:
Borrow cheap yen → convert into another currency → purchase higher-yielding assets.
Japan’s rising rates make that trade progressively less attractive.
Estimates put the broader yen carry-trade ecosystem above $2 trillion, encompassing hedge funds, households and corporations. (Financial Times)
But there’s an important twist.
The yen weakening after the BOJ hike suggests investors aren’t rushing to abandon the trade yet.
That could change quickly if:
Japan raises rates again + the Fed pauses + the yen suddenly strengthens.
That’s when leveraged carry positions could become much more uncomfortable.
🇪🇺 EURO — LOSING GROUND
The euro is also feeling the dollar’s pressure.
EUR/USD traded around:
$1.1476
on September 22. (MarketScreener Hong Kong)
Compare the September progression:
Sept. 8: ~$1.161
Sept. 15: ~$1.154
Sept. 22: ~$1.148
That’s not a crash.
But it is a recognizable downtrend.
The ECB has also tightened monetary policy as energy-driven inflation pressures return. Yet U.S. rate expectations and political developments in Europe have helped keep the dollar in control. (Morgan Stanley)
BuckBully Trend: EUR — 📉 BEARISH / WATCH $1.14
The $1.15 area has now been lost.
The next battle is around $1.14.
🇬🇧 BRITISH POUND — PRESSURE CONTINUES
Sterling traded around:
$1.3383
on September 22. (MarketScreener Hong Kong)
That’s another meaningful decline from approximately $1.35 earlier in September.
The pound has been caught between stubborn inflation and concerns that aggressive rate increases could hurt economic growth.
The result is a familiar central-bank dilemma:
Don’t raise enough → inflation risk.
Raise too much → recession risk.
BuckBully Trend: GBP — 📉 SOFT
The pound isn’t experiencing the yen’s extreme volatility, but its September trend has clearly deteriorated.
🇮🇳 INDIAN RUPEE — SURPRISE WINNER OF THE DAY
One of September 22’s more interesting moves came from India.
The rupee finished approximately 0.2% stronger at ₹95.59 per dollar. (Reuters)
The catalyst?
Oil.
Brent crude fell about 1.5% during part of the session as markets considered the possibility of increased flows through the Strait of Hormuz. Lower oil prices can be particularly beneficial for India because the country is a major energy importer. (Reuters)
There was also evidence of dollar selling by Indian state-run banks, while traders remained alert for central-bank intervention. (Reuters)
BuckBully Trend: INR — 👀 WATCH
India demonstrates perfectly why oil belongs in every serious currency discussion.
Lower crude can provide immediate relief to large energy-importing economies.
🛢️ OIL FALLS BELOW $100
This is another major change from September 15.
Last week, oil above $105 was one of the biggest forces driving inflation fears and currency markets.
By September 22:
Brent crude: ~$99.25
WTI crude: ~$94.99
Improved Saudi exports and increased shipping through the Strait of Hormuz helped push prices lower. Saudi flows through Hormuz had recently increased from roughly 700,000 barrels per day in August to around 2.9 million barrels per day. (Reuters)
That’s potentially important for currencies.
If oil continues declining:
India benefits.
Japan gets some inflation relief.
Europe gets some inflation relief.
Canada loses part of its energy-related currency tailwind.
Central banks receive less pressure to raise rates.
But oil remains highly sensitive to geopolitical developments, so this trend can reverse quickly.
🇨🇳 CHINESE YUAN — THE QUIET CURRENCY
While the yen, euro and pound have been moving significantly, China’s yuan remains comparatively calm.
Reuters reported the yuan holding relatively steady as investors looked ahead to continued U.S.-China diplomatic discussions and a planned meeting between Presidents Donald Trump and Xi Jinping. (Reuters)
That relative stability continues to distinguish CNY from many other major and emerging-market currencies.
BuckBully Trend: CNY — ➡️ STABLE
Sometimes the most interesting currency is the one refusing to participate in the volatility.
📊 CURRENCY BOARD
| Currency | Approx. Sept. 22 Level | Trend |
|---|---|---|
| 🇺🇸 Dollar Index | ~100.54 | 📈 Bullish |
| 🇯🇵 USD/JPY | ~157.5 | 📉 Yen weak |
| 🇪🇺 EUR/USD | ~1.148 | 📉 Euro weakening |
| 🇬🇧 GBP/USD | ~1.338 | 📉 Pound weakening |
| 🇮🇳 USD/INR | ~95.59 | ↗️ Rupee firmer |
| 🇨🇳 CNY | Relatively stable | ➡️ Neutral |
| 🛢️ Brent crude | ~$99.25 | 📉 Falling |
These are September 22 market snapshots rather than fixed exchange rates; FX and commodity prices move continuously. (Investing.com)
🔥 SURPRISE MOVE OF THE WEEK: BOJ HIKES—YEN FALLS
If there is one development that defines September 22, this is it:
Japan raised interest rates to a 31-year high and its currency still weakened.
That’s an important lesson about forex.
A currency doesn’t automatically strengthen because its central bank raises rates.
What matters is the relative monetary-policy picture.
Japan moved to 1.25%.
But U.S. rates remain considerably higher, and markets expect additional Federal Reserve tightening.
That keeps the carry trade alive.
And it keeps USD/JPY elevated.
🌎 CENTRAL BANKS HAVE CHANGED THE ENTIRE CURRENCY MARKET
September started with investors debating when central banks might eventually ease.
Three weeks later, the conversation looks very different.
The Federal Reserve, ECB and Bank of Japan have all moved toward tighter policy, with renewed energy-price pressure contributing to inflation concerns. Morgan Stanley’s economists said during the week that their forecasts for all three central banks had been revised toward additional rate increases. (Morgan Stanley)
That’s a major shift.
The world spent years becoming accustomed to extremely cheap money.
September 2026 is providing a reminder that currencies behave very differently when central banks compete to fight inflation.
💵 COLLECTOR WATCH: JAPANESE YEN REMAINS #1
For BuckBully’s physical-currency side, Japan remains my headline market for September—not because every yen note is suddenly valuable, but because no other major currency has generated this much financial-market attention.
Look at the month’s storyline:
Sept. 1 — ¥160
⬇️
Sept. 8 — ¥153
⬆️
Sept. 15 — ¥155
⬆️
Sept. 22 — ¥157.5
That’s an extraordinary amount of movement for a major currency.
For resale inventory, that makes Japanese notes worth researching by series, condition, scarcity and discontinued designs, rather than simply buying ordinary circulating notes because the yen is in the news.
The same collector rule still applies:
Exchange-rate movement creates attention. Scarcity creates collectible value.
🐂 BUCKBULLY BOTTOM LINE
September has now given us four completely different currency snapshots:
September 1: 💵 Dollar strong — Yen near 160
September 8: 🇯🇵 Yen roars back — USD/JPY near 153
September 15: 💵 Dollar rebounds — USD/JPY near 155
September 22: 💵 Dollar takes control — USD/JPY near 157.5
And now we’re almost back where we started.
But underneath those numbers, something important has changed.
The Fed has raised rates.
The BOJ has raised rates.
The ECB has tightened.
Oil has moved from above $105 back below $100.
And markets are beginning to realize that the next stage of the currency cycle may be less about which central bank cuts first—and more about which one has to keep raising rates longest.
Right now, the dollar is winning that battle.
But USD/JPY approaching 160 brings Japan’s intervention risk right back onto the radar.
That makes the final week of September particularly interesting.
BuckBully Currency Watch: 💵 USD — Bullish | 🇯🇵 JPY — Weak / Intervention Watch | 🇪🇺 EUR — Bearish | 🇬🇧 GBP — Soft | 🇨🇳 CNY — Stable | 🇮🇳 INR — Improving with lower oil
Disclaimer: Currency exchange rates fluctuate continuously. This article is for informational and educational purposes only and does not constitute individualized financial or investment advice.