THE Country Fire Authority has declared Monday, December 9 a Total Fire Ban day for the Wimmera and Mallee.
No fires can be lit in the open air between 12.01am and 11.59pm.
The CFA has advised people living in areas at risk of fire to activate their bush fire plan.
The Wimmera's fire danger rating for Monday is severe, while it is extreme for the Mallee.
Horsham is expected to reach a top of 40 degrees on Monday.
Victoria's Emergency Management Commissioner Andrew Crisp said the state's fire agencies and emergency managers were on alert and prepared for the conditions.
"Despite experiencing a mild start to summer, hot, dry and windy conditions are expected tomorrow, with the potential for increased fire activity," he said.
"It's important for all Victorians to be aware that fires can happen anywhere and without warning.
"We've been ensuring fire agency crews are well prepared, and it's also extremely important that the community is ready."
Mr Crisp said Victorians should take action to protect themselves from the heat tomorrow and look after those most at risk.
"This includes your neighbours living alone, the elderly, the young, people with medical conditions and don't forget your pets," he said.
"Stay aware of your surroundings and if you're travelling or in unfamiliar places, make sure you are aware of the local risk. Know how to stay informed and never rely on one source for emergency information."
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