There are a couple of banks and cashpoints in Wengen :
Berner Kantonalbank – Located on the main street on the left hand side if walking from the railway station, there is a cashier and a cash machine outside.
Open Monday – Friday 8.30am – 11.30am, 3pm – 5pm except Wednesday when it doesn't open in the afternoon. Tel : +41 33 855 12 18
Raiffeisenbank – Located on the right hand side of the main street if walking up from the railway station, the bank also has a cash machine as well as cashier facilities.
Open Monday- Friday 8.30am-12.00pm, 2pm- 5pm and Saturday 8.30am-11am. Tel : +41 33 854 11 11