Total fire ban for northwest Victoria

A total fire ban has been declared for parts of Victoria's north and west as the state faces temperatures up to 39C.

Fires are banned in the Mallee, Wimmera and Northern Country regions on Tuesday, with the Bureau of Meteorology predicting many towns to hit 39C before possible late showers.

"CFA advises people living in areas at risk of fire to activate their bush fire plan," a CFA statement said on Monday.