I'm not sure what time they stay open to.
There are both banks and money exchanges in Khao Lak but I think these will be closed by the time you get there. Banks have better rates than money exchanges in my experience.
However, I use a Direct Debit card to draw cash at any of the ATMs you will find both at the airport and in Khao Lak.
Oh I forgot to ask
Does Thai bank open on Saturday?
I am flying off this Friday for a weekend
And I need to change money on Saturday at bank
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