Hey everyone, Hirokichi here.
There was a big move in the currency market on July 21, 2026. The yen briefly fell to 163 per dollar, its weakest level since December 1986 – that is a full 39 years and 7 months. If you saw the headline and thought “wow, it really got here,” you were not alone. In this post I want to walk through why the yen has weakened this much and what it means for Japanese stocks.
Why did the yen fall to 163? Middle East tensions and “safe-haven dollar buying”
On the morning of July 21 in the New York market, the yen briefly touched 163 per dollar (Nikkei). In London trading the same day, the yen traded around 163.00-163.10, marking the same 39-year-7-month low (Nikkei).
The main driver is escalating tension in the Middle East, including continued exchanges of attacks between the U.S. and Iran. In moments like this, investors tend to avoid risk and buy the U.S. dollar as a relatively safe asset – what’s often called “safe-haven dollar buying” – and that has pushed the yen lower against the dollar. The day before, on July 20, the rate stood at 162.53 (Trading Economics), so the yen weakened by nearly a full yen in just one day.
How significant is a 39-year low?
“39 years and 7 months” takes us back to December 1986, just before Japan entered its bubble economy era. The yen has actually been drifting weaker throughout 2026, and when it first reached the 160 range in early May, there were reports that the government and the Bank of Japan (BOJ) stepped in with an estimated 5 trillion yen worth of yen-buying intervention (Gaitame.com Money Ikuse Channel). Even so, the slide did not stop, and the rate has now pushed up to the 163 range.
Is a weak yen good for Japanese stocks? Exporters and inbound tourism stand to benefit
A weaker yen is not necessarily bad news for Japanese stocks. In fact, on July 21 the Nikkei 225 jumped 3.26% from the previous week’s close to 66,231, while the TOPIX gained 2.44% to 4,015. Buying returned after a three-day holiday weekend, and the view that a weak yen helps exporters’ earnings also supported the market. Just three days earlier, on July 17, the Nikkei had dropped 2,694 points on a sell-off in AI chip stocks (related post: Nikkei Plunges 2,694 Yen to 64,141 as AI Chip Stocks Tumble), which made the size of this rebound stand out even more.
When the yen weakens, overseas sales and profits are worth more once converted back into yen, which is a tailwind for companies with a high share of exports, such as automakers and electronics makers. A weaker yen also makes a trip to Japan look cheaper from abroad, so it tends to boost inbound tourism demand, which can spill over into hotel and station-area retail spending (Yahoo! Finance Japan).
The downside: higher import costs and BOJ intervention risk
On the other hand, a weak yen has real downsides too. Rising import prices tend to push up costs broadly, from electricity and raw materials to labor, which weighs on domestic-focused companies and household budgets (Yahoo! Finance Japan). Nikkei’s reporting also noted views that “real demand is pushing the yen down” and that “the impact on the stock market is limited,” while some experts pointed to “Japan-specific weakness” and said “165 is within sight” (Nikkei), suggesting the yen’s slide may not ease off easily.
Given this backdrop, the market increasingly expects that the government and the BOJ could step in with yen-buying intervention somewhere in the 161-163 range (Yahoo! Finance Japan). Coordination between Japanese and U.S. currency authorities is said to be close, with no objection reportedly raised by the U.S. side over intervention carried out since late April, and continued wariness of intervention is likely to keep a lid on how far the dollar can rise against the yen.
What to watch next: three key points
Here are three things I am personally keeping an eye on as this plays out.
(1) The timing and scale of currency intervention: with the 161-163 range in focus, whether authorities actually step in could be a major turning point.
(2) The path of Middle East tensions: since safe-haven dollar buying is the main driver behind this move, the yen’s slide could ease if the situation calms down.
(3) U.S. and Japanese monetary policy: depending on the direction the Fed (the U.S. Federal Reserve) and the BOJ take, interest rate differentials could move the yen sharply in either direction.
Personally, I think of this as a bit of a double-edged sword: a weak yen is a tailwind for export-oriented stocks, but it adds to the cost-of-living burden for households and domestic-focused businesses through higher prices. It might be a good moment to think through whether your own holdings sit in a sector that tends to benefit from a weak yen, or one that tends to feel the cost pressure instead.
日本語版はこちら → yen-163-jp-stocks-2026
* This article is for informational purposes only and does not recommend any specific investment. Please make investment decisions at your own responsibility.
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