There is the time period when the spread is highest and lowest of all, so these time periods are necessary to remember, reason for such a thing to happen is the volatility or liquidity that this market holds.
When doing trading, you might notice that the spread of every currency is different in that there would be some currency pairs that have low spread. On the other hand, there will be some currencies that hold high spread values. The currency which has the lowest spread is known as major currency meaning it is the currency in which most people trade-in that’s why it has higher volume and lower spread.
Additionally, one should know that the liquidity of any currency can dry up, and the spread may widen at certain points majorly when there is some news that can end up changing the direction of the currency strength.