Asian currencies found some relief at the end of the week as a sequence of softer US economic reports reduced expectations that the Federal Reserve would raise interest rates in September.

The Taiwan dollar produced one of the most visible moves. Reuters reported that it recorded its biggest daily gain in four months on August 14 and reached its strongest level in more than a month, supported partly by foreign flows into Taiwanese equities.

The market data supplied for this article also places the Indonesian rupiah at IDR17,820 per US dollar, up 0.22% on Friday and 0.36% for the week.

What can be confirmed is the larger global catalyst: the US dollar weakened sharply as traders reduced their expectations for another Federal Reserve rate increase.

The Dollar’s Problem Was Bigger Than Inflation

The dollar index fell to approximately 99.67 on Friday, down about 0.25% during the session. A separate global Reuters market report placed the index near 99.65 later in the day.

The move followed several US data releases.

July producer prices were unchanged from June, compared with economists’ expectations for a 0.2% increase. On an annual basis, the Producer Price Index slowed to 4.7% from 5.5%.

Consumer inflation had already given investors another relatively benign signal.

July CPI increased 0.1% month on month and 3.4% from a year earlier. Core CPI increased 0.2% monthly and 2.5% annually.

The combined numbers reduced the urgency for further monetary tightening.

Fed Hike Odds Fell Twice in Two Days

Following Thursday’s PPI report, financial markets priced the probability of a September Federal Reserve rate increase at roughly 35%, down from around 41%.

By Friday, that probability had fallen further.

US retail sales unexpectedly contracted 0.6% in July, prompting investors to cut the implied chance of a September rate increase to around 31%.

That makes the timing important.

The 35% figure in the original material was broadly accurate following the PPI release, but it was no longer the latest reading by the end of Friday.

Why Lower Fed Expectations Help Asian Currencies

Higher US interest rates can attract capital toward dollar-denominated assets.

When investors begin to believe the Fed will stop tightening, the relative yield advantage of US assets can become less compelling.

That can reduce demand for dollars and support currencies in emerging markets.

The effect is particularly meaningful in Asia, where currencies have spent much of 2026 reacting to elevated US Treasury yields, energy shocks and geopolitical risk.

MUFG has repeatedly identified US yields and Fed expectations as major drivers of Asian FX performance.

But a weaker dollar does not benefit every currency equally.

Taiwan Has an AI-Era Advantage

Taiwan’s currency had an additional domestic catalyst: foreign equity inflows.

Reuters reported that overseas capital entering Taiwanese stocks helped push the Taiwan dollar to a more than one-month high on August 14.

Taiwan is also one of the most direct beneficiaries of the global semiconductor and artificial-intelligence investment cycle.

That matters because MUFG expects Asian currency performance to become increasingly differentiated during the second half of 2026.

Its regional outlook describes a “two-speed Asia”, where exposure to AI investment, external competitiveness and domestic policy fundamentals determine which currencies outperform.

The Taiwan dollar’s strength therefore reflects more than a simple decline in the US dollar.

The Rupiah’s Weekly Gain Needs Context

The Refinitiv figures supplied for this article show the rupiah strengthening from IDR17,885 to IDR17,820 per dollar over the week, a gain of roughly 0.36%.

If confirmed, that would place the Indonesian currency among the stronger Asian performers for the period.

But the broader picture remains more cautious.

MUFG has previously argued that the rupiah remains sensitive to elevated US yields even after Bank Indonesia strengthened its policy and foreign-exchange support.

The bank’s broader second-half forecast expects a softer dollar to support Asian currencies in aggregate, but it does not expect a uniform regional rally.

Indonesia therefore still faces the possibility of renewed pressure if Treasury yields rise, energy prices jump or global risk sentiment deteriorates.

The Philippines Shows the Other Side of the Story

The Philippine peso did not receive the same benefit.

The Philippines is a net oil importer and has been among the Asian economies most vulnerable to the Middle East energy shock. Reuters has highlighted the peso, rupee and rupiah as currencies that have experienced significant pressure during periods of oil-market disruption.

On August 14, Brent crude settled at $88.52 a barrel, up 1.67% as renewed US-Iran tensions raised fears about supply.

For the Philippines, more expensive oil means more dollars are required to finance imports, increasing pressure on the local currency.

Oil Is Becoming Asia’s Biggest Complication

The current currency backdrop contains two opposing forces.

The first is positive for Asian FX: softer US data is reducing expectations of another Fed hike and weakening the dollar.

The second is negative: renewed Middle East tensions are lifting oil prices.

For energy importers, higher oil prices can worsen trade balances, increase inflation and reduce disposable income.

Reuters has previously described the 2026 energy shock as especially difficult for Asia because of the region’s heavy reliance on imported crude.

That means an extended rise above or around $90 Brent could offset some of the benefit from a weaker dollar.

MUFG Still Sees Uneven ASEAN Risks

MUFG’s view is not that all ASEAN currencies are entering a sustained bull market.

The bank has maintained a cautious stance toward selected regional currencies, particularly when US yields remain elevated.

In June, it retained a near-term dollar-positive strategy against selected currencies including the rupiah, baht and ringgit.

It also noted that Asian currencies had faced broad pressure after the June Federal Reserve meeting and that country-specific economic conditions were becoming increasingly important.

Its second-half outlook is more constructive on Asian FX overall, but strongly emphasises divergence rather than a single regional trend.

What Could Reverse the Rally?

Three developments could quickly change the direction.

First, US inflation. A new acceleration could restore expectations for another Fed hike. Although current market odds are only around 31%, policy expectations can shift rapidly with incoming data.

Second, oil. Brent has returned to the high-$80s as US-Iran tensions intensify. A fresh spike would be particularly damaging for oil-importing Asian economies.

Third, portfolio flows. Taiwan demonstrated how strongly foreign equity inflows can influence a currency. A reversal of those flows could work just as quickly in the opposite direction.

Bottom Line

The US dollar ended the week under pressure after a series of softer economic reports.

July producer prices were flat, consumer inflation moderated and retail sales unexpectedly dropped 0.6%. The dollar index fell to around 99.67, while markets reduced the probability of a September Federal Reserve rate increase to approximately 31%.

That environment helped Asian currencies, with the Taiwan dollar recording its biggest daily rise in four months.

The supplied market data also shows the Indonesian rupiah appreciating to IDR17,820 per dollar and gaining 0.36% over the week, although those precise figures still require independent confirmation.

The stronger conclusion is therefore not that the dollar has lost its global dominance.

It is that softer US data temporarily shifted the balance in favour of selected Asian currencies—and Taiwan and Indonesia were among the clearest beneficiaries.