Home / Course / Module 2 / Forex Sessions and Liquidity: When the Market Is Busy
Module 2 · Lesson 5 of 7Forex trades around the clock on weekdays, but it is not equally busy at every hour. Knowing the sessions helps you understand spreads, volatility and why prices behave differently at different times.
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Because forex has no central exchange, trading follows the sun. As one major financial centre closes, the next one opens. From the Sunday evening open (UK time) to the Friday evening close, there is almost always a bank somewhere quoting prices.
Traders talk about four sessions, named after the main financial centre active at the time: Sydney, Tokyo, London and New York. Sessions are a way of describing who is awake, and they are not official opening bells.
The market never really closes during the week, but activity rises and falls. More activity usually means tighter spreads and more movement.
Exact hours vary by source and change with daylight saving. The table gives rough UK times, so treat it as a guide, not a fixed schedule.
| Session | Approx. UK time | Typical character |
|---|---|---|
| Sydney | About 21:00 to 06:00 | Quieter, thinner trading; Australian and New Zealand dollar pairs more active |
| Tokyo (Asia) | About 00:00 to 09:00 | Often calmer, with yen and Asia Pacific pairs most active |
| London | About 07:00 to 16:00 | Very busy; the largest share of forex dealing takes place here |
| New York | About 12:00 to 21:00 | Busy, especially when US data is released |
London is widely regarded as the single most important centre for forex dealing, and New York is next. Gold is also busiest when London and New York are open, as covered in What Moves Gold Prices.
An overlap is a period when two sessions are open together. The most watched is London and New York, roughly 12:00 to 16:00 UK time. With banks in both centres active, there are more buyers and sellers, so liquidity and movement are often at their highest.
A quieter overlap also exists between Tokyo and London for a short window in the morning, and between Sydney and Tokyo overnight.
These are tendencies, not rules. A quiet London morning or a wild Asian session can happen if news arrives. Never assume a pattern will repeat.
Liquidity is how easily you can buy or sell without moving the price. A liquid market has many participants, tight spreads and quick fills. A thin market has fewer participants, so even modest orders can push the price.
Think of a busy high street at midday compared with the same street at 3 a.m. At midday you can swap goods quickly at a fair price. At 3 a.m. there are few people, and it is harder to find someone willing to deal.
These spread figures are illustrative. Real spreads vary by broker and moment.
Thin markets also bring slippage, which is when your order fills at a worse price than requested, and gaps, where the price jumps past levels, such as after the weekend. A stop loss in a gap may fill at a price beyond the stop level.
Scheduled news (see What Moves Currencies) causes sudden bursts of volatility and wide spreads, often just before and after release times. Holding a position through major news is a decision that deserves extra thought.
Also be aware that the UK, US and Australia change their clocks on different dates. For a few weeks each year, session times shift relative to UK time, and overlaps can be an hour earlier or later than you expect. Check your chart platform's time zone setting too, because many platforms show server time rather than your local time.
Opening trades just before big news with a tight stop. Spreads widen and prices can jump, so stops can fill far from where you placed them.
Sessions are best used for planning, not for prediction. A few practical habits follow from what you have learned.
The point is to know the environment you are in, not to find a magic hour. A calm Tokyo session may offer small ranges, which suits some approaches and is dull for others. Your trading plan should state the hours you are willing to trade, so that decisions are made calmly in advance rather than in the heat of a fast market.
There is no universally best time. Busier times usually have lower costs and more movement, but the best time depends on the pair, your strategy and when you can pay attention.
Yes. Trading generally pauses from Friday evening to Sunday evening UK time, which is why gaps can appear at the weekly open.
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