The problems began this morning at about 10.30am AEST.
At that time, the bank said on its Facebook page that customers should, if possible, carry out transactions either online or at ATMs.
Contacted for comment at the time, a Westpac spokesperson said: "We are experiencing technical issues impacting some Westpac branch systems around Australia.
"Online and mobile banking, ATMS and EFTPOS are working normally. We sincerely apologise to customers for any inconvenience and will try and have our branches operating normally as soon as possible.
In the evening AEST, a Westpac spokesperson said the bank was confirming that all branch systems had been restored.
"Customers who have experienced a financial loss as a direct result of the branch systems issue will be compensated," the spokesperson said.
The last time the bank faced issues with its banking services the situation was the reverse: online banking was affected while people could get their work done in-branch.
This was in November last year, with the problems beginning on 23 November and being resolved by 26 November.