The Department of Foreign Affairs and Trade (DFAT) has raised the overall travel warning to Thailand urging people to “reconsider your need to travel”.
In a statement a DFAT spokesperson said the higher level reflects the strong possibility of further violent clashes in Bangkok.
"These clashes could involve the use of lethal force and could occur at any time," the spokesperson said.
"It also reflects the possibility of civil disorder in other parts of Thailand, including attacks against government and military targets, which may occur with little warning."
"We urge Australians absolutely to avoid any protest sites or demonstrations in Bangkok and other locations in Thailand."
There is also strong advice that Australians should especially avoid the main protest site in the area known as Ratchaprasong in central Bangkok.
The Thai Government may seek to disperse demonstrators from this area and other locations and this may be met with resistance resulting in violent clashes.
"Australians should also be vigilant in nearby areas, including the Silom Road commercial and tourist district, as violence could spread.
Travellers are warned not to travel to Yala, Pattani, Narathiwat and Songkhla.
The government also urged Australians to avoid any prominent buildings associated with the Thai Government and military.
At this stage there are no reports of civil disturbances affecting the operations of Bangkok's Suvarnabhumi Airport.
All Australians in Thailand or intending to travel to Thailand are advised to read and consider carefully the travel advice onDFAT's Smart Traveller website.
In a consular emergency if you are unable to contact the Embassy, you can contact the 24-hour Consular Emergency Centre on +61 2 6261 3305 or 1300 555 135 within Australia.
