Firefighters are hoping for a little relief on Friday as winds ease before a day of "traditional fire weather" on Saturday.
State control centre spokesman Graeme Baxter said conditions would continue to be hot and dry on Friday but lighter winds would mean less fire activity.
"(We're expecting) potentially a lighter wind tomorrow before some increasing wind over the weekend," Mr Baxter told AAP on Thursday evening.
Hot and windy conditions sparked spot fires outside containment lines of the two major bushfires burning out of control in Victoria on Thursday.
Watch and act warnings remained in place on Thursday evening for the Glenfalloch area, which is under threat from the Aberfeldy fire, east of Melbourne, and the Hotham Heights and Dinner Plain area in the Alpine region.
But the state control centre said there was no immediate threat to property.
Mr Baxter said the spot fires were "doing okay".
"Towards the end of the day generally conditions became a little calmer, humidity rises so the fire activity does decrease.
"We'll just keep monitoring it."
The Bureau of Meteorology has predicted maximum temperatures of 30-plus across the state until Saturday.
Victoria's Fire Services Commissioner Craig Lapsley warned that the week of hot days would lead to extreme and severe fire danger in parts of Victoria.
"Saturday will be a day that is more the traditional fire weather," Mr Lapsley said.
"It's the day that will be hot, it will be northerly winds, it will be strong winds but the critical factor is it will have a southwesterly change which will see the wind change move through the state in one day."
He said over the last couple of weeks the changes had moved through over two days.
"As we know in Victoria we lose more property, we have a bigger impact after the change than before the change."
He said people should be prepared and cautioned against fatigue following six weeks of fire alerts.
"Some people say, `Well I've heard the story' and we say it again, `Stay focused.'"
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