The ban applies to the Central, Mallee, North Central, North East, Northern Country, West and South Gippsland and Wimmera fire districts.
Conditions across these districts are forecast to be hot, with low humidity and moderate north-westerly winds ahead of a gusty south-westerly change.
Showers are set to develop later in the day.
The ban means no fire can be lit in the open air or allowed to remain alight from 12.01am to 11.59pm on the day of the declaration in affected districts.
CFA chief officer Jason Heffernan said the combination of heat, wind and low humidity could create dangerous fire conditions.
“Humidity will be low and conditions will be very dry across the state, meaning new fire starts could occur earlier in the day,” he said.
“These conditions will make it very difficult for firefighters to control a fire if one starts.
“We’re asking people in affected districts to strictly follow the conditions of the total fire ban and think carefully about how the increased fire risk could affect them.
“Make sure your fire plan is up to date and covers all possible scenarios.”
Victorians can find out if it is a total fire ban in their district on the CFA website at cfa.vic.gov.au, where information is usually published by 5pm the day before a total fire ban.
For more information on what you can and can’t do on a Total Fire Ban day, visit the ‘Can I or Can’t I’ page on the CFA website.