The trend estimate for domestic sales of Australian produced wine was 35.3 million litres in September, a decrease of 0.6pc from August 2008, according to the Australian Bureau of Statistics.
The seasonally adjusted estimate was 34.3 million litres this month, down 0.1pc from August and a decrease of 4.8pc on September last year.
The ABS has broken the sales figures down by wine type, with the trend estimate for domestic sales of Australian-produced white wine falling by 0.5pc to 17.0 million litres - 1.3pc lower than the same time last year.
The seasonally adjusted estimate was 16.5 million litres in September, unchanged from August and 7.8pc lower than September 2007.
For red and rosé wines, the ABS trend estimate for domestic sales fell by 1.2pc to 12.7 million litres this month.
The seasonally adjusted estimate was 12.3 million litres in September, a decrease of 1.2pc on August and 2.6pc lower than September 2007.
On the export front, sales of Australian-produced wine increased by 2.8pc this month to 68.9 million litres.
The value of the exported wine in September 2008 was $240m.
Australia exported 695.9 million litres, with a total value of $2.6 billion in the 12 months ending September 2008.
This was a fall of 13.1pc in volume and a decrease of 14.0pc in value over the corresponding period to September 2007.