UPDATE: FIRE crews are battling blazes across Victoria and even putting out unattended campfires as the heat continues to climb.

A State Control Centre spokeswoman told Weekly Times Now at 3.25pm crews were working on several fires but two were of great concern.

"The most serious is a fire at Mt Richmond near the South Australian Victorian border," she said.

An aircraft and helicopter were being sent to south-west Victoria to help 20 people tackling the blaze.

The Country Fire Authority issued an emergency warning for the fire, which could affect the Lake Monbeong and Swan Lake camp grounds.

Fire Services Commissioner Craig Lapsley said the fire was in a national park and would run into small hamlets on the eastern side of the fire.

He said the fire had no major settlement in its path. However, farming communities could be threatened.

People considering leaving should head for Portland.

Mr Lapsley said the fire will close the Princes Highway.

Another fire emergency services are also eagerly watching is a bushfire a Kalimna, in East Gippsland.

The spokeswoman said the fire was in grass and scrub and had swept through a gully and may threaten community assets.

A watch and act warning has been issued for the Kalimna fire.

Closer to Melbourne, firefighters tackled a grassfire in wetlands in Dandenong South earlier today.

She also said crews had put out two unattended campfires, the first in the Grampians and the second in Tocumwal.

People are being advised to check the CFA's Facebook and Twitter account for updates and advice messages as its website struggles with demand. 

At 2.05pm the mercury in Melbourne was 38C.

Across country areas, Bairnsdale was 42.2C, Hopetoun 42.4C, Edenhope 42C, Dartmore, 42C, Ballarat 36C, Geelong 40C, Kilmore Gap 34.5C and Albury 39C.