In September, there are no major public holidays. However, there are several religious festivals in the month which may or may not be bank holidays depending on which state you live in. Regional holidays are decided by the respective state governments.
According to the list of bank holidays announced by the RBI, most states wont have any banking operations on September 2, 17, and 21 as these days will be observed as Bank holidays for the upcoming month.
Here is a look at the list of Bank Holidays falling in the month of September
Additionally, both private and public sector banks will remain closed on the second, fourth Saturday, and Sunday. Netbanking and mobile banking facilities will continue to operate even on holidays unless specified by the bank.