[QUOTE=Exec Talent]ATMs are available Saturday and Sunday and offer the best exchange rate. HSBC is a good option. Cambios will be open on Saturday usually until around 2:00.[/QUOTE]
But, do remember that between 22.00 and 06.00 one may withdraw only 100 reais ONCE. This because there has been lots of kidnappings where the criminals have taken the victims from ATM to another forcing them to withdraw max everytime.