Sheep graziers are warned that showers, local hail and thunder and cold westerly winds are expected today.

There is a risk of losses of lambs and sheep exposed to these conditions.

Today across the south-west will be cloudy with guaranteed showers, most likely during the morning and afternoon.

Snow is expected to fall above 500 metres later.

There's the chance of a thunderstorm from late this morning with gusty winds and possible hail.

Winds will be westerly 25 to 40 km/h turning south-westerly 30 to 45 km/h in the middle of the day then decreasing to 20 to 30 km/h in the evening. Daytime maximum temperatures across the region will be around 10 degrees.

A cold front to the south-west will cross the state today, with a cold and unstable south-westerly airstream developing as a large high pressure system develops south of WA.

The high will move over the Bight during Tuesday before moving over eastern South Australia on Wednesday and extending a ridge southeast across Victoria.

The ridge will gradually move east across Victoria on Thursday as the high moves across northern NSW and another front approaches from the west.

For the rest of the week, Tuesday we can expect showers with a top of 12, Wednesday it turns with a cloudy top of 15, Thursday is a mostly sunny 17, Friday is back to showers and 13, Saturday scattered showers 12 and Sunday partly cloudy 13.

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