London is the undisputed centre of global forex trading. Despite operating from a single city, the London session handles approximately 35–40% of all daily forex transaction volume worldwide — more than New York and Tokyo combined. For South African traders, it also opens at the most convenient time of any major session: 09:00 SAST, right at the start of the local working day.
Why London Dominates
The concentration of forex volume in London reflects history more than geography. The City of London developed as the primary hub for international currency trading over centuries, and every major global bank maintains a significant European trading desk there. When London opens, institutional order flow begins in earnest — not just from European banks, but from global players whose primary forex execution occurs during London hours regardless of where their headquarters are located.
The practical consequence: London is where the day's major price moves tend to originate. The high-probability setups that technical traders rely on — breakouts from Asian-session ranges, institutional order blocks, support and resistance levels — are most likely to play out with real follow-through during London hours.
London Session Hours in SAST
Summer (British Summer Time, roughly late March to late October): 09:00–18:00 SAST
Winter (Greenwich Mean Time, roughly November to late March): 10:00–19:00 SAST
The UK observes daylight saving time, adjusting clocks forward in late March and back in late October. South Africa does not observe daylight saving time, so there is a 1-hour shift in the London session's SAST equivalent during those transition periods. Most trading platforms and economic calendars automatically adjust displayed times for your local timezone — but it is worth understanding why the London open occasionally appears at 10:00 SAST instead of 09:00.
The London Open: 09:00–11:00 SAST
The first two hours of the London session often produce the most significant directional move of the day. This is when:
- Institutional orders from overnight briefs execute. Banks, asset managers and hedge funds place orders based on overnight analysis at the London open. These large orders move price and create the day's initial bias.
- The Asian range breakout occurs. During the Tokyo session, EUR/USD and GBP/USD often trade within a relatively narrow range. London frequently breaks this range with conviction in one direction. Experienced traders watch for this break and trade in its direction.
- ZAR pairs activate. South African banks and institutional participants engage during London hours. USD/ZAR spreads tighten, and price moves that were directionless during the Asian session begin to follow more coherent patterns.
For traders with limited time, the 09:00–11:00 SAST window offers the best risk-reward ratio of any two-hour period in the day.
Key Economic Releases During London Hours (SAST)
Major data affecting EUR, GBP and ZAR pairs is released during London session:
| Event | Approximate SAST time | Impact |
|---|---|---|
| UK CPI / GDP data | 09:00 | High — GBP/ZAR |
| Eurozone CPI / PMI data | 10:00–11:00 | High — EUR/ZAR |
| ECB interest rate decision | 13:15–14:00 | High — EUR pairs |
| UK interest rate decision (BoE) | 14:00 | High — GBP/ZAR |
| US data (NFP, CPI, retail sales) | 15:30 | High — USD/ZAR |
The ECB and BoE decisions are particularly significant for South African traders holding EUR/ZAR or GBP/ZAR positions. These events should be treated similarly to SARB MPC decisions: reduce position size ahead of the announcement and widen stop-losses to accommodate the initial spike.
The London–New York Overlap: 14:00–18:00 SAST
Starting at 14:00 SAST, New York opens and overlaps with the still-active London session. This four-hour window produces the highest combined transaction volume of any period in the trading day. For USD/ZAR specifically, this is the prime liquidity window: spreads are tightest, price moves are most directional, and the market is least susceptible to manipulation through thin-book stop hunts.
Traders who can dedicate focus to this window have access to the best trading conditions globally available for ZAR pairs.
London Close: 17:00–18:00 SAST
The final hour of the London session often sees profit-taking and position squaring by European institutional traders. This can produce sharp reversals against the day's trend as large positions are unwound. Many intraday traders avoid entering new positions in the last 30 minutes of London precisely because these reversal moves are difficult to trade with conviction.
If you have profitable intraday positions approaching 17:00 SAST, consider whether to take partial profits rather than holding through London close into the New York-only session.
What Happens After London Closes
When London closes at 18:00 SAST, the market becomes a USD-dominant environment. New York continues until 23:00 SAST, and USD pairs (USD/ZAR, USD/JPY) remain reasonably active. However, EUR/ZAR and GBP/ZAR liquidity drops substantially — European banks are no longer actively pricing these instruments, and spreads widen. This is not the time to trade EUR/ZAR or GBP/ZAR intraday unless a specific news catalyst requires it.
This is general information only, not financial advice. Session hours are approximate and shift during daylight saving transitions in the UK. Trading forex carries a high level of risk and losses can exceed your initial deposit.
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