Can I open a bank account in Thailand while on a visitor visa?

Opening a bank account is easy through an agent.

Get agent do it. Do urself u need pay 5000 for insurance.

Roger Slmonot; Don't know if you have a Thai girl friend or friend, but while here as a tourist, just hop in in several bank branches when you see them. Best chance go in together with a Thai (blue housebook). Bangkok Bank and Kasikorn are the best possibilities. But indeed, it's getting difficult more and more.

I also read about the difficulty in opening Thai bank account but apparently I was very lucky here in Chiang Rai Bangkok Bank. I already had my car and motorcycle Thai driver’s licenses, that might have helped. Here about 2 weeks total and have monthly rental, licenses, and Thai bank account.

It's possible, just not easy, and probably not cheap. The days of just walking into a bank on a tourist visa or visa exempt and opening an account are likely over. Covid changed things, and the Russians arriving en-masse put the nail in the coffin because banks just could not keep up with the number of people applying for bank accounts.

Nowadays you likely need a residence certificate if you want to do it on your own, which you can get from immigration (difficult or impossible as a tourist) or your embassy (also potential impossible, for example the US embassy no longer offers this).

The absolute easiest way will be going through an agent, who will charge between 3,000-5,000 baht but will be effortless.

Doing it on your own, probably the easiest way is finding a bank branch that will open an account for you if you purchase 1 year of insurance, the price is usually 5,000 baht. Bangok Bank is best known for this, but you might have to try multiple branches to find success.