Warrnambool is expecting a top temperature of 23 degrees today after a cloudy start.
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There's a high 70 per cent chance of showers, most likely during the morning and afternoon.
There is also the chance of a thunderstorm during the same time.
The Bureau of Meteorology is predicting light winds..
Casterton is expected to top the south-west temperatures with 26 degrees, Hamilton is tipped to get to 25, Colac 23, Port Fairy 22 and Portland 21.
A high pressure system passing south of Tasmania extends a weak ridge across Victoria.
A low pressure system over the Bight is moving eastwards and will be centred near north-west Victoria this evening.
The low will cross southern NSW on Thursday then move over the Tasman Sea on Friday as the next high pressure system forms south of Western Australia.
The high will cross the Bight on Saturday and extend a ridge across Victoria.
Warrnambool top temperatures for the next week are tipped as 21 degrees on Thursday, Friday 18, Saturday 18, Sunday 21, Monday 27 and Christmas Day 27.
