The local bourse rose 0.2 per cent on Monday, with a slump in miners counterbalancing rallies in banks and defensive sectors such as utilities and health care. The Australian dollar traded at US70.17¢.
The Reserve Bank's nine-member policy board will announce its decision at 2:30pm in Sydney. Economists widely predict a quarter-point increase to 4.6 per cent, the highest level since November 2011. Traders are also pricing an end to the RBA's two-meeting pause, against a backdrop of spiralling energy prices across the global economy.
Investors will closely scrutinise both the rate statement and Governor Michele Bullock's press conference an hour later, seeking clues on whether the central bank is prepared to deliver back-to-back hikes in November or prefers to watch and wait through the rest of the year.
"The risk sits with the need to tighten monetary policy further beyond September given the inflation backdrop," said Belinda Allen, head of Australia Economics at Commonwealth Bank of Australia. "But it is not an easy decision to push monetary policy further into restrictive territory."
Wall Street wobbled overnight as bonds spiked, adding to the cautious sentiment ahead of the RBA's decision. The broader market mood globally remains sensitive to interest rate expectations as central banks grapple with persistent inflation.