At 1200 AEDT on Wednesday, the local unit was trading at 74.86 US cents, up from 74.80 cents on Tuesday.
The improvements in the US economy have investors strongly pricing in a US interest rate rise in December.
Stephen Innes, senior currency trader at CFD and FX broker OANDA Australia and Asia Pacific, said the Aussie had been resilient in the face of a stronger US dollar and weakness in the iron ore sector.
“The Aussie was holding its ground despite big falls in iron ore prices,” Mr Innes said on Wednesday.
After trading above the psychological $US80 a ton level for the first time in two years, industrial metals dropped more than six per cent in response to China’s pulling of punitive sanctions on its domestic coal industry, Mr Innes said