There's a very high (90 per cent) chance of showers and a thunderstorm - which we've already had.

Winds will be westerly 15 to 20 km/h tending south-westerly 20 to 30 km/h in the morning then tending southerly in the late afternoon.

At 7.30am in Warrnambool it was 6.8 degrees, felt like 3.2 and since 9am yesterday we've had 10.6mm of rain.

Warrnambool is expecting a top temperature of 13 degrees, Hamilton 11, Colac 12, Ararat 12, Casterton 13, Mortlake 13, Heywood 12, Portland 12, Port Fairy 13, Terang 11 and Camperdown 10.

South-west sheep graziers are warned that cold temperatures, rain and showers and south-west to southerly winds are expected during Monday and Tuesday.

There is a risk of losses of lambs and sheep exposed to these conditions.And there's of course a strong wind warning for the west coast in place.

A cold front is crossing eastern Victoria this morning.

A high pressure system centred over the Bight will extend a ridge over western Victoria on Tuesday as a low pressure system develops near the NSW coast.

The low will then drift slowly south-east on Wednesday and Thursday as the high moves to the south-west of Tasmania.

For the days ahead, Warrnambool is expecting showers and scattered showers for the next three days - Tuesday, Wednesday and Thursday - with tops of 12 degrees, before a mostly sunny 15 degrees on Friday and a partly cloudy 17 on Saturday.