Thursday across the south-west will be mostly sunny, but there's wet and cool weather on the way for the next three days.
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There's a 95 per cent chance of rain Friday with tops of just 12 degrees predicted for Saturday and Sunday.
Today there's a medium (60 per cent) chance of showers, most likely late this afternoon and evening.
Winds will be light, becoming south-easterly 15 to 20 km/h in the late afternoon then becoming even lighter in the evening.
Warrnambool is expecting a top of 19 degrees, Hamilton 21, Colac 19, Ararat 22, Casterton 21, Mortlake 20, Heywood 19, Portland 17, Port Fairy 18, Terang 18 and Camperdown 18.
A weak high pressure ridge will persist across the state today as a low pressure trough deepens into a low over South Australia.
The low will approach north-western Victoria late on Friday and extend a trough southwards across the state as a cold front approaches Tasmania.
During Saturday the low will track south-east across eastern Victoria as the front sweeps across Tasmania and a large high pressure system develops south of WA.
The high is forecast to move slowly east during Sunday as a low pressure trough develops over north-eastern Victoria.
For the week ahead - tomorrow there's a 95 per cent chance of rain with a top tipped of 17 degrees, Saturday cloudy 12, Sunday cloudy 12, Monday partly cloudy 15, Tuesday partly cloudy 16, Wednesday partly cloudy 17 and Thursday partly cloudy 17.
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