If you don‘t have long stay visa and address in Thailand the bank will not allow you to open an account. For 2 month it is absolutely not necessary at all. Bring no cash with you, but at least 2 cards for ATM. In case one is lost or is make troubles, you might have a backup. Visacard is also accepted by ATM.
sorry, to be more precise: it is the decision of CCSA which is lead by the prime minister. The cabinet needs to approve, but that should be just an act of formal issue.