The fire danger rating is expected to rise today as Victoria's firefighters battle bushfires that have destroyed four homes.

Three homes were destroyed at Creightons Creek, near Euroa, in northern Victoria, while another house was razed at Lake Rowan, near Wangaratta, on Wednesday.

A number of sheds and livestock have also been claimed as the bushfires, sparked mainly by lightning earlier in the week, burn in the state's north and northeast.

State control centre spokeswoman Kim Payne says crews will spend Thursday getting on top of the fires as the fire danger is set to slightly increase, bringing more gusty winds and warmer temperatures.

"It will be a very high fire danger rating in those parts of the state where those fires are," she told AAP.

Fires causing the most concern are at Lake Rowan, near Wangaratta in the state's north east, which have burned 5700 hectares.

Another blaze at Creightons Creek, near Euroa in northern Victoria, has scorched 4900 hectares.

Emergency Management Commissioner Craig Lapsley says the fire danger will be very high on Thursday across the west central and north east part of Victoria.

"It's not an extreme day but on the same token, fire would still move around the environment and people need to be conscious of that," he said.

"They'll be more in a controlled environment that can still cause impact on property."

More than 350 fires have sparked since Monday, mainly caused by lightning in the state's northeast but only a small number remain uncontrolled.

© AAP 2014