After threatening skies looked to halt the one-off car/driver-swap, it appears like the weather will hold and the F1 car will be able to complete its scheduled laps around the famous Bathurst circuit.
It will be the first time a modern Formula One car has lapped the 6.213km track.
F1 McLaren driver Button will kick off proceedings with five laps around the track before Lowndes gets to make his debut in an F1 car with a five lap stint.
Both drivers will also get some laps in a TeamVodafone Holden Commodore V8 Supercar.
CLICK HERE for yesterday's story with Lowndes and a full schedule of the test …
Stay tuned to Speedcafe.com for all the latest from Bathurst and the unique driver swap.