The Australian dollar fell to a fresh three-month low on Tuesday, sliding 0.3% to $0.6867 as the US dollar extended its recent rally.
The currency is now trading dangerously close to its March trough of $0.6834, signaling that recent support levels are under significant pressure.
The sell-off reflects a broader surge in the greenback, which is weighing heavily on commodity-linked currencies.
The New Zealand dollar joined the decline, falling 0.2% to a 2-1/2-month low of $0.5702 and marking a fifth consecutive session of losses.
This synchronized weakness suggests that regional safe-haven flows and dollar demand are overriding local economic differentials.
Previously, the Australian dollar had managed to maintain its position above US70¢, defying broader pressure on commodity currencies.