A sheep graziers alert has been issued warning that cold temperatures, showers and fresh south-westerly winds are expected during Wednesday evening and Thursday.

There's also a marine strong wind warning in place for the west coast.

Today across the south-west is expected to be cloudy with a medium chance of showers, most likely during this afternoon and early evening. Winds will be west to south-westerly 30 to 45 km/h.

At 7am in Warrnambool it was a mild 9.9 degrees.

Warrnambool is expecting a top of 17 degrees, along with Hamilton, Mortlake, Heywood and Port Fairy, Colac and Ararat will get to 19, Casterton 18 and Portland just 16.

A trough extending from the interior of the continent will move east across northern Victoria today, ahead of an approaching cold front that will cross the south-west in the afternoon and evening.

A vigorous and cool south-westerly air stream will follow, slowly moderating from the west during Thursday and Friday as a high south of the Bight moves towards Tasmania.

On Saturday the high will move east of Tasmania with airflow over Victoria turning warmer northerly.

For the days ahead - Warrnambool will be a cloudy 15 degrees tomorrow with a chance of morning fog, Friday cloudy 17, Saturday a partly cloudy 22 with the chance of a shower and Sunday 22, with showers increasing and between 3-8mm of rain.

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