There will be patchy fog early this Monday morning across the south-west.
It will be a sunny morning and afternoon.
Light winds will become south to south-westerly 15 to 25 km/h in the early afternoon, becoming even lighter in the late evening.
Warrnambool is expecting a top temperature of 25 degrees, Hamilton a much warmer 35, Colac 34 and Portland 26.
A low pressure trough will linger near north-eastern Victoria today as a high pressure system becomes established over the Tasman Sea.
Another trough will form over inland Victoria on Tuesday and will drift eastwards on Wednesday as a weak cold front crosses Tasmania.
A ridge of high pressure will form south of the state on Thursday as a stronger cold front develops over waters south of Western Australia.
Tuesday and Wednesday are expected to be hot with a 30 per cent chance of showers on Thursday.