At GRU Airport´s terminals you will find agencies of the main banks in the country.
Here is a list with the location and working hours of each bank:
BANCO BRADESCO
Terminal 2 - Mezzanine – Check-in E
+55 (11) 2445-4141/4144
10:00 am - 4:00 pm.
http://www.bradesco.com.br
BANCO DO BRASIL
Terminal 2 - Mezzanine – Check-in E
+55 (11) 2445-4960/4962
10:00 am - 7:00 pm.
http://www.bb.com.br
BANCO ITAÚ
Terminal 2 - Mezzanine – Check-in D
+55 (11) 2445-3079/3239
10:00 am - 7:00 pm.
http://www.itau.com.br
BANCO SANTANDER
Terminal 2 - Mezzanine – Check-in C
+55 (11) 2445-2906/2907
10:00 am - 4:00 pm.
http://www.santander.com.br