The USD/JPY pair rebounded to near 159.50 during Friday's Asian session, with the yen finding renewed support after a period of recent volatility. The primary factor driving the pair lower stems from improved inflation data out of Japan, as price growth in the Tokyo metropolitan area reaccelerated in August, prompting markets to increase their bets that the Bank of Japan (BOJ) will continue tightening monetary policy at its September meeting. Meanwhile, attention on the US side is turning to Federal Reserve Chair Kevin Warsh's highly anticipated speech at the Jackson Hole global central bank symposium, meaning the short-term direction of the dollar-yen is being influenced by shifts in interest rate expectations on both sides of the Pacific.
Data released by Japan's Ministry of Internal Affairs on Friday showed Tokyo's headline CPI rose 1.9% year-on-year in August, up from 1.8% in July. The core CPI, which strips out fresh food, climbed 1.8%, accelerating from a downwardly revised 1.7% in the prior month and edging past the 1.7% that markets had anticipated. More notably, the measure that excludes both food and energy — a gauge the BOJ watches closely — rose 2.0% year-on-year, a clear pickup from the previously revised 1.8% reading. This batch of data signals that underlying inflationary pressures in Japan retain a degree of persistence, offering fresh justification for continued policy normalization.
Tokyo inflation figures carry outsized market significance because they are widely treated as a leading indicator for nationwide price trends. If core inflation continues to hover near or reach the BOJ's 2% target while wages and service prices remain sticky, the case for maintaining an ultra-loose policy stance becomes increasingly untenable. Money markets have already markedly raised the odds of a rate increase at the September 17-18 policy gathering, with pricing at one point reflecting roughly an 86% probability of a hike. This means the yen's sensitivity to Japanese inflation data is visibly on the rise.
However, signals from within the BOJ remain less than fully unambiguous. Deputy Governor Ryozo Himino has previously stated that the central bank needs to pay greater attention to upside risks to inflation than in the past, emphasizing that timely rate increases help avoid a scenario that could force an abrupt and aggressive tightening later. That rhetoric leans clearly hawkish, yet he stopped short of explicitly confirming a September move. It is precisely this communication style — tilting hawkish without laying out a concrete timeline — that led some investors to scale back September hike wagers earlier, driving a phase of yen weakness.
From a policy-logic perspective, the core question facing the BOJ has gradually shifted from whether to end ultra-easing at all to how quickly rates should rise. If Tokyo core inflation continues to hold near target while economic activity and wage growth show no marked deterioration, the central bank is likely to favor a gradual path of policy rate increases. Conversely, should an excessively strong yen pull import prices notably lower, or should domestic demand cool more substantially, the BOJ may opt to slow the pace of tightening. Thus, even with high September hike probability, material uncertainty persists around the subsequent policy trajectory.
On the dollar side, focus has turned squarely to Jackson Hole. Fed Chair Kevin Warsh is slated to deliver a keynote address at 10:00 AM local time on August 28, marking his first major speech at the symposium since assuming the role. With US inflation still running at elevated levels and long-term Treasury yields holding firm, investors are scouring his remarks for clues on inflation assessments, the likely path of rates, and potential shifts in the Fed's policy framework. Market attention on Warsh's speech is running notably higher than typical policy-official commentary, given that the dollar, US Treasury yields, and September FOMC policy expectations could all be swayed by his tone.
Recent US PCE data for July did not fully upend existing market assumptions, but inflation remaining above the Fed's 2% target keeps traders cautious about the scope for near-term rate cuts. Meanwhile, long-end Treasury yields are sitting at relatively elevated levels, while fiscal deficits and government financing needs add further uncertainty to dollar-denominated rate assets. Should Warsh emphasize that inflation risks remain pronounced and signal the need to hold restrictive rates — or even tighten further — US yields could gain fresh upward momentum, lifting the dollar and potentially propelling USD/JPY back toward a test of the 160.00 handle. Conversely, should he pivot toward highlighting growth risks, labor market shifts, and policy flexibility, markets could revive expectations of lower US rates, pressuring the dollar and deepening the downside pressure on USD/JPY.
As it stands, USD/JPY finds itself in a classic tug-of-war between improving yen fundamentals and dollar policy risk awaiting confirmation. The Japanese inflation data has provided directional support for the yen, but whether the dollar genuinely turns weaker still hinges on the Fed chair's speech delivering new rate signals. In this environment, even a break below the 159 level in the near term does not necessarily signal a completed trend reversal; likewise, reclaiming the 160 mark should not be simplistically read as the yen's tightening logic having failed.
Over the coming sessions, three variables warrant close monitoring. First, whether BOJ officials further amplify the signal for a September hike. Second, what impact Warsh's speech has on US rate expectations. Third, whether US Treasury yields and the dollar index move in tandem. If the BOJ maintains a hawkish tilt while the Fed progressively leans dovish, the yield advantage favoring the dollar over the yen could narrow further. If US inflation stickiness forces the Fed to hold or even reinforce restrictive policy while the BOJ remains cautious, USD/JPY may continue to trade in a high-level range.
Looking at the daily chart structure, USD/JPY remains in a high-level consolidation pattern. After rebounding to near 159.50, short-term bullish momentum has shown signs of waning. The pair is trading below the 100-day simple moving average but still hovers above the midpoint of the Bollinger Bands, suggesting the medium-term bullish structure has not been fully dismantled — though overhead resistance is becoming increasingly visible. The daily RSI sits around 47, in a neutral-to-soft zone, indicating upside momentum is fading. Immediate resistance lies at the 160.00 area, where the 100-day MA converges. A decisive break above that opens the door to the upper Bollinger Band near 160.30, and sustained strength beyond that level could re-open space toward the 161.00 and even 162.00 region. On the downside, initial support rests at the Bollinger mid-band around 158.85. Losing that exposes the lower band near 157.45, and a break below that level could usher in a more pronounced medium-term correction.
On the 4-hour timeframe, USD/JPY has formed a choppy, mildly bearish structure since pulling back from the 160 zone. Short-term moving averages are flattening, and MACD momentum is converging from a previously bullish state toward neutral territory, suggesting buyers currently lack the sustained force to push the pair through the 160 mark. The 159.00-158.85 region stands as the key support zone that short-term bulls need to defend. If the pair stabilizes in that area and subsequently breaks above 159.70-160.00, a retest of 160.30 remains possible. Conversely, a 4-hour close below 158.85 could open the path toward 158.00 and then 157.45.
Overall, the technical picture has yet to establish a clear one-way trend. The 160.00 level remains the pivotal gauge for gauging near-term USD/JPY strength, while evolving policy expectations from the BOJ and the Fed will determine whether any technical breakout receives confirmation from the fundamental backdrop.
In summary: Tokyo's core inflation ticking up to 1.8%, with the ex-food-and-energy gauge reaching 2.0%, is reinforcing market expectations for further BOJ policy normalization, providing fresh fundamental support for the yen. At the same time, Fed Chair Warsh's Jackson Hole address is set to be the other decisive variable for USD/JPY. In the near term, 160.00-160.30 forms the key resistance zone overhead, while 158.85 serves as the critical downside line in the sand. If the BOJ amplifies the signal for a September hike and Warsh's tone leans dovish, USD/JPY could open up substantially more downside. If US rate expectations reignite, however, the 160 level could still be reclaimed. The key takeaway is not any single data point, but whether the monetary policy divergence between Japan and the US is genuinely beginning to narrow. If this trend persists, the medium-term risk of a high-level decline in USD/JPY rises further; if US yields climb anew, the pair may hold its elevated range while awaiting a fresh directional catalyst.
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