How Public Holidays and Market Hours Shape Forex Liquidity

What Are Market Hours and Liquidity?

The foreign exchange market never sleeps – it operates 24 hours a day, five days a week, but it is not a single, monolithic pool of money. Instead, trading flows through three main geographical sessions: the Asian session (anchored in Tokyo), the European session (centred on London), and the North American session (driven by New York). When two sessions overlap, trading activity peaks; when one session winds down, interest often fades.

Liquidity describes how easily you can buy or sell a currency pair without causing a sharp price move. Think of it as the depth of the market – a deep pool has many orders at different price levels, so a single large trade barely disturbs the surface. A shallow pool, on the other hand, lacks resting orders, so that same trade can cause a visible ripple. The most reliable sign of high liquidity is a tight bid‑ask spread: the difference between the price at which you can sell (bid) and the price at which you can buy (ask). In major pairs such as EUR/USD, a normal spread might be 1 pip (0.0001).

Local public holidays in a major financial centre throw a spanner into this rhythm. When London is closed for a bank holiday, or Tokyo shuts for Golden Week, the usual army of market makers, corporate treasurers, and institutional traders simply does not show up. The pool gets shallower, and the remaining participants widen their spreads to protect themselves against sudden news while depth is thin. The same principle applies to holidays in any country whose currency is actively traded – South Africas human rights day, for example, can quietly thin out ZAR pairs.

The Building Blocks: Liquidity, Spreads, and Order Flow

Before you can interpret the effect of a holiday, you must be clear on three linked ideas.

• Liquidity measures the number of resting buy and sell orders. Large, liquid pairs (EUR/USD, USD/JPY) attract the most participants; exotic pairs that include an African currency often have a much thinner order book.
• Spread is the direct cost of entering and exiting a trade. For most pairs it is quoted in pips. A pip is usually the fourth decimal place (0.0001), except for Japanese‑yen pairs where it is the second decimal (0.01). When liquidity evaporates, spreads widen because market makers need a larger buffer.
• Order flow refers to the actual transactions that move the price. During periods of low liquidity – for instance, a public holiday in Europe combined with quiet Asian hours – order flow becomes lumpy. There are fewer counterparties, so your market order might “slip” further before finding a match.

The forex market is decentralised, so these conditions are never uniform. Even the busiest pair can suffer ragged pricing when its primary hub is asleep or on holiday.

How to Think About Liquidity During Holidays: A Hypothetical Example

Let us walk through a deliberately simplified scenario to make the mechanics tangible. All numbers are hypothetical and anchored to the reference EUR/USD rate of 1.1535, but the pattern is real.

Normal London session – deep liquidity

Bid: 1.15350

Ask: 1.15360

Spread: 0.00010 (1 pip)

UK bank holiday, Asian hours – thin liquidity

Bid: 1.15330

Ask: 1.15380

Spread: 0.00050 (5 pips)

Holiday overlaps with the US open, but depth stays modest

Bid: 1.15340

Ask: 1.15370

Spread: 0.00030 (3 pips)

What does this actually mean? The spread has widened, so the entry cost is higher. The bigger concern, however, is slippage: if you place a market order to buy at the quoted ask of 1.15380, you might actually get filled at 1.15390 because the few available orders were consumed instantly. The wider spread is only the visible part of the iceberg.

A simple step‑by‑step way to think about the process:

1. On a normal business day, major banks and funds actively quote two‑way prices, creating a dense order book.
2. When a leading forex hub goes on holiday, many of those two‑way dealers go absent.
3. The remaining participants widen their spreads to cushion against the risk of a news shock while only a handful of counterparties are present.
4. For a retail trader, the same trade now costs more in spread and may experience slippage that was absent on a normal day.

Common Misunderstandings and Limitations

• “A wide spread means the market is moving.” Spread says nothing about direction. It simply tells you that the gap between bid and ask has grown. A pair can sit perfectly still with a 10‑pip spread.
• “Only the holiday currency‘s pairs are affected.” When a major centre like London is shut, the liquidity drain spreads beyond GBP pairs. Globally active institutions may step back across the board, or the absence of a deep price discovery engine can ripple into EUR/USD and even into some Asian pairs.
• “The spread is the only cost.” Slippage – the difference between the price you expect and the price you actually get – rises in thin markets. A broker’s quoted spread might still look narrow, yet real‑world fills become worse.
• Holidays are not the only culprit. Low liquidity also appears during session transitions, weekends, and immediately before high‑impact news releases. A trader who understands the calendar can anticipate when spreads are likely to widen, but that knowledge does not tell you what the price will do.

The Bottom Line: What It Is and What It Isnt

Market hours and local public holidays affect how easily you can enter or exit a trade, not which direction the price will move. Swings may happen, but the core mechanism is about liquidity and transaction cost. Keeping this boundary clear protects you from misreading a temporary pricing quirk as a trading signal. As one concise guardrail: “It measures the ease of trading, not the direction of price.”