Today across the south-west will be cloudy with a very high (90 per cent) chance of rain during this afternoon and evening.
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The Bureau Of Meteorology is tipping between six and 15 millimetres, with the possibility of heavy falls and there will be light winds.
The BOM says there's a 50 per cent chance of at least six mms and a 25 per cent of at least 15mm.
Sunday's top in Warrnambool reached 38.6 degrees at 5pm and overnight the temperature didn't drop much 20.
Warrnambool is expecting a top of 27 degrees, Hamilton 31, Colac 32, Ararat 36, Casterton 29, Mortlake 30, Heywood 27, Portland 23, Port Fairy 25, Camperdown 27 and Terang 27.
A high pressure system lies over the Tasman Sea as a low pressure trough deepens over central Australia extending into western Victoria.
A cold front developing south of the Bight will interact with the trough and reach southwestern Victoria around midday, then move eastwards across the State during the afternoon, clearing the east early Tuesday morning.
A new high pressure system moves over waters south of the Bight late Tuesday, and reaches south of Tasmania on Thursday as the trough deepens again over inland Australia.
For the week ahead - Warrnambool is expecting a cloudy top of 18 degrees for Australia Day, another cloudy day on Wednesday 18, Thursday partly cloudy 25, Friday showers 23, Saturday mostly cloudy 22 and Sunday partly cloudy 20.
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