USD/JPY climbs above 159 as yen support momentum fades

The US dollar moved back above 159 against the Japanese yen after a coordinated push to support the yen briefly drove the pair down to 155, market participants said. The fast rebound has kept traders focused on how much yen weakness officials are prepared to accept and how often they might step in again.

Earlier this month, USD/JPY had been close to breaking 165 before Japanese authorities sought support from the US government, according to the information provided. Data showed joint yen purchases, alongside a public-relations effort, initially pulled the exchange rate lower from a peak near 164.

Coordinated action pulled USD/JPY to 155, but the move reversed That dip was short-lived Market participants described the initial decline as being linked to coordinated yen-buying that pushed the pair down to 155. That dip was short-lived, with USD/JPY later returning above 159 and trading back near 160. The speed of the reversal has become the key point for investors watching the currency. Participants said the market is now inclined to keep probing where the boundary of official tolerance sits, particularly as the pair edges back toward round-number levels. Westpac sees a near-160 base case and a gradual drift lower After the rebound above 159, Westpac questioned how durable the impact of the joint effort can be without further follow-through. The bank said the move back toward 160 has encouraged traders to keep testing how far officials will allow the yen to weaken.

Westpac framed its base case as USD/JPY holding around 160 for the foreseeable future, followed by a gradual move lower. In its multi-year forecasts, Westpac projects 154 by end-2027 and 146 by end-2028.

The bank added that even those projected levels would still place the exchange rate about 32 percent above the 1990–2019 average. Westpac said this indicates a structural shift in how the two currencies trade relative to each other.

Policy expectations and coordination timeline remain central

As part of its view, Westpac cited doubts about sustained policy tightening by the Bank of Japan. The bank’s assessment suggests the yen’s longer-term path, in its view, remains driven more by policy expectations than by one-off operations.

Market participants said they will watch for any renewed coordinated action by Japanese or US authorities through Aug. 31, 2026. They also said they may reprice rate differentials if expectations for tighter US policy begin to fade ahead of that date.

For traders, the main uncertainty is whether additional coordinated steps follow the initial action, or whether officials allow market pressure on the yen to rebuild. Participants said that question is likely to stay at the center of trading as USD/JPY returns to levels near 160.