When the US Dollar Index (DXY) starts to weaken, the forex market often sees a wave of “non-USD currency rebound” movements. This not only means that major currencies such as the euro and Japanese yen appreciate, but also provides traders with diversified profit opportunities. The core drivers behind this phenomenon are often closely related to US dollar weakness and changes in global central bank policies. This article will explore in depth the reasons that trigger a rebound in non-USD currencies, analyze the potential momentum of major currencies, and remind you of the risks that need attention in this type of market movement.
The US Dollar Index, often abbreviated as DXY, is a comprehensive indicator that measures changes in the US dollar’s exchange rate against a basket of six major currencies (namely the euro, Japanese yen, British pound, Canadian dollar, Swedish krona, and Swiss franc). Simply put, it is like a dashboard showing the US dollar’s “overall strength” globally.
When DXY falls, it directly reflects that the US dollar is depreciating against these major currencies. This naturally creates room for non-USD currencies to appreciate, forming a rebound. Therefore, tracking the trend of the US Dollar Index (DXY) is the first step in judging whether a rebound in non-USD currencies has begun.
The fundamental factors affecting the strength of the US dollar lie in the US economy itself and its monetary policy. The following situations usually lead to a weaker US dollar and trigger a rebound in non-USD currencies:
As the world’s primary safe-haven currency, the US dollar’s movement is also closely related to global market risk sentiment. When the global economic outlook is optimistic and geopolitical risks cool down, market “risk appetite” (risk-on) rises. At this time, investors tend to withdraw capital from relatively safe US dollar assets and shift into emerging market currencies or commodity currencies with higher risks but also higher potential returns. This likewise drives a broad rebound in non-USD currencies.
Against the backdrop of a weaker US dollar, not all non-USD currencies will rebound at the same pace. Each country’s own economic fundamentals and central bank policies determine its respective “rebound momentum”.
The euro accounts for nearly 60% of the US Dollar Index and is the US dollar’s most important counterpart currency. The euro’s trend is mainly driven by the monetary policy of the European Central Bank (ECB). If the ECB adopts a more hawkish stance than the Fed to fight inflation (such as continuing to raise rates) the interest rate differential between Europe and the US will narrow or even reverse, which will strongly support the EUR/USD exchange rate.
The logic behind the Japanese yen’s movement is relatively special. On one hand, when global safe-haven sentiment rises, the yen and the US dollar often strengthen together. However, against the backdrop of a weaker US dollar caused by its own economic issues, the yen’s movement depends more on the policies of the Bank of Japan (BOJ). For a long time, the BOJ has maintained ultra-loose monetary policy and yield curve control (YCC), resulting in a huge interest rate gap between the yen and other major currencies. Therefore, any hint that the BOJ may adjust or abandon its YCC policy could trigger a sharp appreciation of the yen.
The British pound is usually highly volatile, and its movement is affected by both the Bank of England’s (BOE) determination to fight inflation and the UK’s own economic data (such as employment and retail sales). If the BOE shows a stronger willingness to raise rates than the market expects, it will provide support for the pound. Conversely, if economic data shows that the UK may fall into recession, it will put pressure on the pound.
The Australian dollar and Canadian dollar are known as “commodity currencies” because their value is highly correlated with commodity prices. The Australian dollar is linked to the prices of industrial raw materials such as iron ore and coal, while the Canadian dollar is closely related to crude oil prices. When expectations of a global economic recovery are strong and drive commodity demand, the Australian dollar and Canadian dollar usually perform strongly during a rebound in non-USD currencies.
Why Is the US Dollar So Strong? Uncovering the Four Core Drivers Behind “Dollar Support”
The “divergence” in monetary policies among major global central banks is the core driver of the forex market. Understanding these differences is key to capturing rebound opportunities in non-USD currencies. Below, we use a simplified table to present an overview of the policy stances of major central banks in June 2026:
| Central Bank | Policy Rate (Estimated) |
Inflation Rate (Estimated) |
Policy Bias |
| US Federal Reserve (Fed) | 3.75% | 2.8% | Dovish (considering rate cuts) |
| European Central Bank (ECB) | 3.50% | 3.1% | Hawkish (maintaining high interest rates) |
| Bank of Japan (BOJ) | -0.1% | 2.2% | Extremely dovish (maintaining YCC) |
| Bank of England (BOE) | 4.25% | 3.5% | Neutral to hawkish |
*Note: The above data is a hypothetical scenario based on current market trends in 2026 and is for illustrative reference only.
As seen from the table above, if the Fed begins cutting rates while the ECB keeps rates unchanged, the “interest rate differential” between the two will narrow. Capital will flow from the lower-yielding US dollar into the relatively higher-yielding euro in search of higher returns, which will become the main driving force pushing up the EUR/USD exchange rate. Traders need to closely monitor public remarks by officials from the two major central banks, as well as changes in inflation and employment data, to anticipate the future direction of interest rate differentials.
The Bank of Japan’s YCC policy essentially sets an upper limit for the yield on its 10-year government bonds. This has made the yen’s interest rate disadvantage extremely obvious in an environment where global central banks have generally been raising rates, which was the main reason for the yen’s sharp depreciation previously. However, once Japan’s inflation data remains steadily above 2%, the pressure on the BOJ to abandon YCC will increase sharply. Any change in market expectations regarding this could trigger intense volatility in the yen exchange rate and create potential trading opportunities.
The inflation problem facing the UK is more difficult than that of Europe and the US, forcing the BOE to maintain higher interest rates. High interest rates support the pound, but they also suppress economic growth and may even trigger a recession. This contradiction makes the pound’s movement highly uncertain. When trading the pound, traders should not only look at interest rate decisions, but also pay attention to data that reflects economic vitality, such as GDP and PMI.
After understanding the driving factors behind it, how to operate in practice and avoid risks is the final mile to becoming a winner.
In a rebound in non-USD currencies, an effective strategy is “matching strength with weakness”. Identify the currency with the strongest fundamentals and the most hawkish central bank (strong currency), and exchange it against the currency with the weakest fundamentals and the most dovish central bank (weak currency).
The market changes rapidly. When the market is overwhelmingly bearish on the US dollar, any unexpected positive news (such as a US employment report that far exceeds expectations or hawkish remarks from Fed officials) could trigger a sharp rebound in the US dollar. This rebound would force a large number of short US dollar positions to stop out and close, forming a “short squeeze” market movement and causing intense price volatility. Therefore, strictly setting stop-losses is absolutely necessary.
To capture the pulse of a rebound in non-USD currencies, the following indicators are dashboards you must continue to monitor:
A: Under normal circumstances, gold and the US dollar show a negative correlation. As gold is priced in US dollars, when the US dollar weakens (and non-USD currencies rebound), the cost of buying gold decreases for investors holding other currencies. This stimulates demand and pushes up gold prices. Therefore, an environment where non-USD currencies rebound is usually favorable for gold.
A: The Dollar Smile Theory was proposed by economist Stephen Jen. It is a framework that describes the movement of the US dollar under different economic scenarios. The theory suggests that the US dollar exchange rate forms a U-shape (like a smile curve):
A: In addition to trading a single currency pair, investors can also use certain tools to hedge or trade a basket of non-USD currencies. For example, they can trade US Dollar Index (DXY) futures or contracts for difference (CFD). Shorting the US Dollar Index is equivalent to going long on a basket of non-USD currencies at the same time, mainly the euro, Japanese yen, and others. In addition, there are also some ETFs (exchange-traded funds) that track specific forex indexes for investors to choose from.
A: The duration of the rebound depends on how long the driving factors behind it can last. If the US dollar weakens because the US economy shows signs of structural slowdown and the Federal Reserve begins a clear rate-cut cycle, then this rebound may last for several months or even longer. Conversely, if it is only due to short-term weak data or market sentiment fluctuations, the rebound may end quickly. The key lies in continuously tracking changes in the core driving factors mentioned earlier.
A rebound in non-USD currencies is an important trading theme in the forex market. Behind it is the ebb and flow of global capital movement and the economic strength of different countries. Understanding its core drivers, namely the relative strength of the US dollar and policy divergence among central banks, is the key to capturing rebound opportunities. When positioning, investors should choose currencies with the strongest fundamentals, while remembering to watch out for the “short squeeze” risk of a possible US dollar reversal at any time, and establish sound capital management and risk control in order to profit steadily in the changing forex market.
