Asian Session Definition: The Asian session is the first trading window of the 24-hour forex day, when markets in Sydney, Tokyo, Hong Kong and Singapore are active, roughly from 23:00 to 08:00 GMT. Tokyo is its largest centre, so the Japanese yen and the Australian and New Zealand dollars see the most activity. Volume and volatility are usually lower than in the London or New York sessions, which often produces narrow, range-bound price action.
What Is the Asian Session?
Forex has no central exchange, so its “opening bell” is simply the moment banks in the first time zone start quoting prices. That happens in Wellington and Sydney on Monday morning local time, which is still Sunday evening in Europe and America. Tokyo joins a couple of hours later, followed by Hong Kong and Singapore, and together these centres form the Asian session.
Its character is quieter than the sessions that follow. Europe and the US are asleep, and the currency pairs that dominate global volume, such as EUR/USD and GBP/USD, have no home market open. Activity concentrates where local flows exist: Japanese exporters converting dollars into yen, Australian mining revenue, and regional central bank decisions.
Calm does not mean empty. Singapore and Hong Kong are among the largest currency centres in the world, and Japanese investors are some of the biggest cross-border holders of foreign bonds. What the session lacks is the overlap effect, where two giant centres trade at once.
How Does the Asian Session Work?
For a trader who already knows the basics, the useful question is where the session’s price moves come from. Three sources dominate.
Local order flow is the first. At 09:55 Tokyo time, Japanese banks set the Tokyo fix, a reference rate used to settle corporate deals. Importers who need dollars place orders ahead of it, and that demand can lift USD/JPY during the early Tokyo morning.
Regional data and policy come next. Australian employment and inflation figures, Chinese trade and activity data, and decisions by the Reserve Bank of Australia and the Bank of Japan all land in Asian hours. China matters even to traders who never touch the yuan, because it is Australia’s largest export market, so Chinese data often moves AUD/USD.
Positioning for the day ahead is the third source. With Europe closed, many dealers avoid building large positions, and prices tend to form a range that the London session later tests.
That range is the basis of a classic setup. Suppose USD/JPY trades between 150.00 and 150.40 from 00:00 to 07:00 GMT, a 40-pip Asian range. A trader places a buy order at 150.45 and a sell order at 149.95, betting that European volume will push price out of the box.
If London buyers lift USD/JPY through 150.40 at 07:30, the buy order triggers and the trader targets a move roughly equal to the range, to about 150.85. The sell order is cancelled once the breakout holds, and a stop sits back inside the range near 150.20.
Asian Session vs. London Session
| Asian Session | London Session | |
|---|---|---|
| Approximate GMT hours | 23:00 to 08:00 | 07:00/08:00 to 16:00/17:00 |
| Main centres | Tokyo, Sydney, Singapore, Hong Kong | London, Frankfurt, Paris, Zurich |
| Most active currencies | JPY, AUD, NZD | EUR, GBP, CHF |
| Typical price action | Narrow ranges, slower trends | Breakouts, strongest trends of the day |
| Main liquidity risk | Thin order books, especially on Asian holidays | Fast moves at the open and around the 16:00 fix |
Why Is the Asian Session Important for Traders?
Thin liquidity is both the session’s appeal and its danger. Fewer orders in the book mean smaller moves most of the time. But when a large seller does arrive, there are fewer buyers to absorb the flow, and price can fall through several levels at once.
That happened on 3 January 2019. At 9:36 am Sydney time, with Japan on holiday and the US closed for the night, the yen jumped 3% against the dollar in about 30 seconds. According to the Reserve Bank of Australia, AUD/JPY fell about 7% and AUD/USD dropped to a 10-year low of 0.6715 within minutes.
Its analysis traced the move to Japanese retail investors whose carry trade positions hit automatic stop-losses, while trading algorithms withdrew their quotes. Roughly half of the move reversed within minutes, which was little comfort to traders whose stops had already filled at the lows.
A second limitation is that the Asian range can mislead. A quiet night says little about the next move, and many range breakouts at the London open reverse within an hour. The session still gives valuable signals: yen strength during Asian hours often shows that investors are seeking a safe haven before Europe has even opened.
Key Takeaways
- The Asian session opens the forex day, running roughly from 23:00 to 08:00 GMT, with Tokyo as its largest centre alongside Sydney, Singapore and Hong Kong.
- Activity concentrates in the yen and the Australian and New Zealand dollars, because their home markets and regional data are live during these hours.
- Lower volume usually produces narrow ranges, which many traders use as reference levels for breakouts during the London session.
- Thin liquidity is the session’s main risk: when a large order meets an empty book, especially on Asian holidays, price can gap through stops in seconds.
- Yen strength or weakness during Asian hours often gives an early read on global risk appetite before European traders arrive.
What time does the Asian forex session start?
Sydney opens first, around 22:00 GMT in the northern summer and 21:00 GMT in winter, and Tokyo follows at 09:00 Tokyo time, which is 00:00 GMT all year because Japan does not use daylight saving time. Most traders treat roughly 23:00 to 08:00 GMT as the Asian session.
Which currency pairs are best to trade in the Asian session?
Pairs with a home market that is open, such as USD/JPY, AUD/USD, NZD/USD and crosses like AUD/JPY. EUR/USD and GBP/USD also trade, but their spreads are wider and their ranges smaller than in European hours.
Is the Asian session good for scalping?
It can be, because ranges are narrow and many pairs oscillate between clear levels. The catch is that spreads are often wider than during London hours, so a strategy that targets a few pips per trade loses a larger share of each gain to costs.
What is the Tokyo fix?
It is a daily benchmark exchange rate set by Japanese banks at 09:55 Tokyo time, used to price corporate currency deals. Japanese importers often buy dollars ahead of it, especially on settlement days that fall on multiples of five, which can push USD/JPY higher in the early Tokyo morning.
