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Rupiah Rises as Oil Prices Fall and US Treasury Yields Drop

By Markets Desk · 2026-09-18 · 2 min read
A large oil pipeline stretching across a desert landscape
Illustration: Tradingbird

The Indonesian Rupiah breaks its losing streak against the US Dollar as lower crude oil costs ease inflation fears. US Treasury yields retreat to 4.93%, while market attention turns to the upcoming Bank Indonesia policy decision.

The Indonesian Rupiah strengthened against the US Dollar on Friday, halting a six-day decline. The currency pair traded at approximately 17,780 during Asian trading hours. This reversal was driven primarily by a retreat in global crude oil prices. Lower energy costs have reduced concerns about imported inflation in the region. According to GN auto markets/energy: crude oil prices, the drop in oil values provided immediate relief for the local currency.

Oil prices fell after reports indicated that Saudi Arabia is working to restore flows through its East-West pipeline. Market participants also focused on potential diplomatic talks between the US and Gulf region leaders. These developments suggest a stabilization of regional supply chains. The easing of supply-side pressures contributed to the broader decline in energy costs that supported the Rupiah's recent rally.

Bank Indonesia Prepares for Policy Decision

Domestic economic data in Indonesia presents a mixed picture. Headline inflation accelerated to 3.19 percent in August, driven by food price volatility. Bank Indonesia is tasked with containing this inflationary pressure while maintaining currency stability. The central bank has kept borrowing costs unchanged for two consecutive months. Traders are now awaiting the next policy decision, which is scheduled for next week.

The central bank faces a complex balancing act in its monetary strategy. It must maintain an effective interest rate differential relative to the United States. Simultaneously, it aims to support domestic economic growth and uphold Rupiah stability. The uncertainty surrounding the future policy outlook continues to constrain broader market sentiment. Investors are closely monitoring the bank's moves to gauge its commitment to price stability.

US Treasury Yields Retreat to 4.93 Percent

The US Dollar faced headwinds as falling oil prices alleviated broad-based inflationary pressures. This shift pulled US Treasury yields lower from their recent multi-year highs. The benchmark 10-year yield declined to approximately 4.93 percent earlier in the week. It had briefly surpassed the 5.0 percent threshold before retreating. Lower yields reduced the yield advantage for the Greenback, limiting its strength against the Rupiah.

Despite the yield decline, the Dollar's downside potential remains limited due to hawkish commentary from the Federal Reserve. Fed Chair Kevin Warsh emphasized that inflation has remained elevated for an extended period. He noted that recent economic data did not show significant structural improvement. Following his remarks, market expectations for tighter policy shifted rapidly. The probability of a rate hike at the October meeting rose to 53.1 percent, up from 44 percent the previous day.

Hawkish Fed Tone Supports Dollar Strength

The Federal Reserve's stance reflects a disciplined focus on price stability. Warsh stressed the importance of analyzing trends over noisy data points. He reaffirmed the central bank's independence and commitment to its mandate. This hawkish bias supports a narrative of stronger Dollar yields. It creates a challenging backdrop for risk-sensitive currencies like the Rupiah, even as oil prices provide temporary support.

Based on reporting by FXStreet, compiled by the Tradingbird desk.

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