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Asia currencies firm as dollar slips, but oil and Bank Indonesia loom

Asia currencies firm as dollar slips, but oil and Bank Indonesia loom
Markets · 2026
Photo · Marcus Devlin for Daily Digest Invest
By Marcus Devlin Equities Correspondent Aug 18, 2026 4 min read

Asian currencies mostly firmed on Tuesday as the US dollar hovered near a two-month low, but rising oil prices tied to the Middle East conflict and a key central bank decision in Indonesia kept a lid on gains.

The Taiwan dollar rose as much as 0.2% to 31.774 per US dollar, its strongest level in nearly two months, while South Korea's won climbed 0.5%. The moves came as softer US economic data cooled expectations for another Federal Reserve rate hike, which tends to reduce demand for the dollar and support regional currencies.

Yet the upbeat tone was tempered by two factors. First, crude prices have been climbing on concerns that the Middle East conflict could disrupt supply, and higher oil costs are a headwind for Asian importers. Second, traders were on edge ahead of a Bank Indonesia policy decision, which can sway the rupiah and regional sentiment.

What's driving the dollar lower?

The dollar's slide follows a run of softer US data that has led investors to trim bets on further Fed tightening. When the Fed is seen as less likely to raise rates, the appeal of dollar-denominated assets can fade, and capital tends to flow toward higher-yielding or undervalued currencies elsewhere.

That dynamic has been a tailwind for Asian currencies in recent sessions. As we noted in our earlier coverage of soft data cooling Fed hike expectations, the market's read on the Fed is often the single biggest driver for emerging-market currencies.

Still, the dollar's weakness is not uniform. The dollar's slide has lifted currencies across the globe, but Asia faces its own set of challenges.

Oil prices: a familiar headwind

Rising crude prices are a double-edged sword for Asia. Many countries in the region are net importers of oil, so when prices climb, their import bills swell and trade balances can deteriorate. That pressure often shows up in currency markets, as investors worry about the impact on inflation and growth.

The Middle East conflict has added a risk premium to oil, and traders are watching for any escalation that could disrupt supply routes. For now, the moves have been modest, but the uncertainty is enough to keep some investors cautious.

Bank Indonesia decision in focus

Adding to the mix, Bank Indonesia was due to announce its latest policy decision. Central banks in emerging markets often walk a tightrope between supporting growth and defending their currencies. A surprise move—or a hawkish tone—can quickly shift sentiment.

Indonesia's rupiah has been relatively stable, but the central bank's stance on rates and intervention will be closely watched. A decision that signals concern about inflation or capital outflows could weigh on the rupiah and, by extension, other regional currencies.

What it means for investors

For everyday investors, the tug-of-war between a softer dollar and costlier oil is a reminder that currency moves are rarely one-way. A weaker dollar can boost the value of overseas investments and make imports cheaper, but higher oil prices can offset those benefits by raising costs for businesses and consumers.

Equity markets in the region reflected the mixed sentiment. Taiwan's Taiex fell 1% and South Korea's KOSPI dropped 1.1%, even as their currencies strengthened. That divergence highlights how currency gains don't always translate into stock market gains—especially when oil prices are rising.

Investors with exposure to Asian assets should keep an eye on two things: the Fed's next move and the trajectory of oil prices. If US data continues to soften, the dollar could stay under pressure, which would likely support Asian currencies. But if oil keeps climbing, the benefits could be eroded.

As always, it's important to remember that currency markets are volatile and influenced by many factors. Diversification and a long-term perspective remain key for most investors.

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