TOKYO — The Japanese yen has weakened beyond the closely watched ¥160-per-US-dollar level again, putting Japan’s currency authorities back in the spotlight as investors weigh competing signals from the Bank of Japan and the US Federal Reserve.
The yen traded around ¥159.99 per dollar on Tuesday after briefly breaking through ¥160 for the third consecutive session, according to Reuters reporting carried by Channel NewsAsia. The move comes despite growing expectations that the Bank of Japan could raise interest rates at its September policy meeting.
The renewed weakness is particularly significant because the ¥160 level has become a psychological marker for traders and a zone where the possibility of Japanese intervention becomes increasingly difficult to ignore.
Why is the yen falling again?
A major factor is the continuing gap between US and Japanese interest rates.
Markets are increasingly betting that the Federal Reserve could raise US interest rates later this month following hawkish comments from Fed Chair Kevin Warsh. Reuters reported that traders were pricing in a 65% probability of a September Fed rate increase, up from 41% a week earlier.
Higher US rates can support the dollar by making dollar-denominated assets relatively more attractive, while Japan’s slower pace of monetary tightening continues to weigh on the yen.
At the same time, renewed tensions in the Gulf have pushed oil prices higher. Brent crude climbed above US$91 a barrel after US President Donald Trump threatened further strikes against Iran, adding to concerns about inflation and contributing to a global bond selloff.
Japan’s rate-hike dilemma
The yen’s decline is happening even as pressure builds on the Bank of Japan to tighten policy.
Japan’s 10-year government bond yield has reached 3% for the first time in three decades, reflecting changing expectations around Japanese monetary policy and government borrowing.
Reuters reported that markets are now largely expecting the BOJ to raise its policy rate at its September 17–18 meeting, potentially taking the rate from 1% to 1.25%.
US Treasury Secretary Scott Bessent has also publicly expressed confidence that Japan’s government and central bank will take steps that result in a stronger yen. His comments have added pressure on Japanese policymakers as the currency remains near levels that have previously triggered intervention concerns.
But traders remain skeptical that official comments alone will be enough to reverse the yen’s decline.
Japan has already intervened
The current situation is particularly sensitive because Japan and the United States conducted a rare coordinated yen-buying intervention at the end of July.
That intervention briefly pushed the yen away from a 40-year low near ¥164 per dollar. But much of the currency’s gains have since disappeared.
Japanese Finance Minister Satsuki Katayama said after meeting Bessent that Washington and Tokyo remain committed to coordination aimed at maintaining orderly currency movements.
The message is significant: Japan has not ruled out action if currency movements become disorderly, while traders are watching closely to determine how far the yen can weaken before authorities respond.
Could another intervention be coming?
Crossing ¥160 does not automatically mean Japan will intervene.
However, the level has become an important warning sign for markets. Bloomberg-sourced analysis cited by Mint noted that Japanese authorities could potentially act before the next BOJ meeting if the yen were to weaken rapidly.
Former Japanese currency official Mitsuhiro Furusawa has likewise warned that intervention could happen at any time if the yen returns toward the levels seen before July’s coordinated action. He has argued that intervention alone would only buy time and that a faster pace of BOJ rate increases could be needed to address the underlying weakness.
That leaves Japanese policymakers facing a difficult balancing act.
A weaker yen raises the cost of imported goods and energy for Japanese consumers and businesses. But aggressive rate increases could also put additional pressure on economic growth.
The bigger global picture
The yen is not the only currency being affected.
The dollar index, which tracks the US currency against six major currencies, was up about 0.2% at 99.623, while the euro slipped to around US$1.1589 and sterling traded near US$1.3532.
Investors are now watching a crucial batch of US economic data, culminating in Friday’s nonfarm payrolls report. The figures could influence expectations for the Federal Reserve’s next move and, in turn, the dollar-yen exchange rate.
For Japan, however, the immediate question is even more direct:
How much further can the yen fall before Tokyo decides that words are no longer enough?
With the currency once again testing ¥160, the next major BOJ decision, upcoming US economic data and any sign of Japanese intervention could determine whether the yen stages a recovery — or begins another slide toward its previous lows.
For global investors, the ¥160 level is no longer just a number. It is a warning that the battle over Japan’s currency may be entering a new and potentially volatile phase.
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