China's growth rate moderated further in the first part of the year, though recent actions by Chinese policymakers are supporting the near-term outlook, it said.
Commodity prices have firmed noticeably from recent lows, but this follows very substantial declines over the past couple of years. Australia's terms of trade remain much lower than they had been in recent years.
"Sentiment in financial markets has improved, after a period of heightened volatility early in the year," it said. "However, uncertainty about the global economic outlook and policy settings among the major jurisdictions continues," the bank said in a statement.
In Australia, the economy was continuing to rebalance following the mining investment boom.
"Taking all these considerations into account, the board judged that prospects for sustainable growth in the economy, with inflation returning to target over time, would be improved by easing monetary policy at this meeting," Reserve Bank Governor Glenn Stevens said.