Warrnambool is expecting a top of 35 degrees on Thursday, with a late cool change.
Today will be partly cloudy across the south-west with winds northerly 25 to 35 km/h, turning westerly 15 to 25 km/h in the evening.
The fire danger is very high.
At 7.30am in Warrnambool it was already 17.9 degrees.
Hamilton is expecting a top of 34, Colac 33, Ararat 33, Casterton 36, Mortlake 34, Heywood 35, Portland 33, Port Fairy 35, Terang 33 and Camperdown 33.
A high pressure system in the Tasman Sea directs a northerly airstream over Victoria while a low pressure trough crosses the Bight.
The trough will reach the west of Victoria later today then clear to the east of the state on Friday.
Another high crossing the Bight will move towards Tasmania and into the Tasman Sea by Saturday, extending a ridge to the south of Victoria.
Meanwhile, a low pressure trough deepening over South Australia on Saturday will move over Victoria by Sunday.
For the next seven days - Warrnambool is expecting a mostly cloudy Friday with a top of 17 - only about half of today's top temperature - Saturday will be mostly cloudy 23, Sunday 50 per cent chance of showers 23, Monday mostly cloudy 23, Tuesday partly cloudy 23, Wednesday partly cloudy 24 and Thursday partly cloudy 23.
Have you signed up to The Standard's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in the south-west.