Forex sessions and liquidity
Learning objectives
Name the four trading sessions and identify when the significant overlap occurs
Explain how liquidity changes your spread, your slippage and the reliability of a level
Match a session to your own timezone and trading style
What is a market session?
The forex market runs continuously from Sunday evening to Friday evening, which is often described as an advantage. It's more useful to understand that those hours are not equivalent. Some of them are where the market actually happens, and some of them are where beginners lose money to conditions rather than to analysis.
The four sessions
Approximate UK times. All of these shift by an hour with daylight saving changes in different regions at different dates, so confirm against your platform rather than memorising.
Session
UK hours (approx.)
Character
Sydney
22:00 to 07:00
Low activity - opens the week
Tokyo
00:00 to 09:00
Moderate activity - JPY and AUD active
London
08:00 to 17:00
Largest activity by session volume
New York
13:00 to 22:00
High activity - US data releases
The overlap that matters is London and New York, roughly 13:00 to 17:00 UK. Both of the largest sessions are open simultaneously, which produces the deepest liquidity, the tightest spreads and the majority of significant daily movement.
There's a Tokyo and London overlap in the early UK morning, but it's small and Tokyo is winding down through it.
Why liquidity is the point
Liquidity isn't an abstraction. It shows up in three concrete places.
Your spread. More participants quoting means a narrower gap between bid and ask. The same pair can cost several times more to enter during the quiet hours than during the London and New York overlap, which as How traders make money: bid, ask, spread, long and short showed is charged on every round trip.
Your slippage. Thin books mean your order fills further from where you asked, and that applies to your stop. Stop losses: where to set them and why established that a stop is a trigger rather than a guaranteed price, and thin liquidity is when that distinction becomes expensive.
Whether a level holds. A support level tested during the London session is being tested by a large number of participants. The same level tested at 03:00 UK is being tested by very few, and a thin book can be pushed through a level that would have held in daylight. Technical levels are not equally meaningful at all hours.
The dead zone
Between the New York close and the Sydney open, roughly 21:00 to 23:00 UK, liquidity is at its thinnest of the entire week.
Spreads are widest, moves are erratic, and the ordinary relationship between price action and anything meaningful breaks down. This is also when many brokers apply their daily rollover, which frequently comes with a brief spread spike as pricing thins further.
Two practical consequences. Don't open positions here without a reason. And if you hold positions through it, understand that a stop sitting close to price is at its most vulnerable during exactly these hours.
What trades when
Currency activity follows the working day of the economies involved.
- Tokyo session: JPY pairs, AUD and NZD. Asian economic data.
- London session: EUR and GBP pairs are at their most active, and EUR/GBP in particular is effectively a London instrument.
- New York session: USD pairs, driven by US data releases which typically land at 13:30 UK.
- The overlap: everything. This is when EUR/USD, the most traded instrument in any market, does most of its work.
The implication is that trading a pair outside its own session means trading it at its widest spread and its thinnest book, for no compensating benefit.
Session character
Tendencies rather than rules, and worth holding lightly.
Asian hours are often range-bound. Lower volume, fewer catalysts, and price frequently establishes a range that later sessions break.
The London open is often where direction gets established, and it's the most common time for a genuine breakout of the Asian range.
The New York session tends to continue the London move early on, then fade into the afternoon as London participants close out.
Treat these as background rather than as a strategy. They describe what often happens, and a system built on them will encounter long stretches where they don't.
Fitting a session to your life
This is where the lesson becomes practical, and the answer differs by where you are.
From the Gulf, the London and New York overlap falls in your evening. That's genuinely workable for a day trader, but it means committing your evenings, and Trading styles: scalping, day, swing and position was blunt about what that costs. Swing trading, which needs less continuous presence, may fit better around a full-time job.
From Southeast and East Asia, the Tokyo session is your working day and the London open lands in your late afternoon. The overlap that matters is your late evening or overnight. Which points either toward trading the Asian session on yen and Aussie pairs, or toward a swing approach that doesn't require you to be present at the busiest hours.
The wrong answer in both cases is to pick a style first and then discover it demands hours you don't have. Session availability is one of the three constraints that should determine your style, not something you work around afterwards.
The weekend
The market closes Friday evening and reopens Sunday evening. Prices can and do open away from where they closed.
A stop cannot protect you across a gap, because there was no trading at your level. Anything held over a weekend needs to be sized for that possibility rather than for a normal move, and How to trade news events covers the same logic for scheduled releases.
Key takeaways
The London and New York overlap, roughly 13:00 to 17:00 UK, has the deepest liquidity, tightest spreads and most of the day's significant movement
Liquidity determines your spread, your slippage and whether a technical level is being tested by many participants or very few
The hours around the New York close and Sydney open are the thinnest of the week, with the widest spreads and the most vulnerable stops
Session availability is a constraint that should shape your trading style, not a problem to work around after choosing one