So if you're planning on heading to the golf course, make sure you take your big umbrella, with predictions for up to 20mm to fall on Saturday in the Ballarat region.

The rain band will start slowly with just a few light showers overnight, but as Saturday progresses, it will become heavier and set in.

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This evening, Ballarat could see up to 5mm and the ran will gradually increase. Temperatures are set to stay cool, with tops of no more than 13 degrees expected for both days this weekend.

Bureau of Meteorology senior forecaster Michael Efron said the rain would be heaviest in the Wimmera district, pushing down into the north-central and central regions. The south-west of the state is also likely to cop about 20mm.

"We're going to see light rain developing around midnight tonight and into the early hours of Saturday," Mr Efron said.

"Throughout the afternoon and into the evening, it will become heavier. We'll see about 15-30mm across the Melbourne region. Some suburbs could see totals of 40mm. If that is the case, totals will be around three quarters of the September average in 24 hours."

Mr Efron said one feature - or lack-of feature - will be the wind, which will only be a gentle northerly breeze before it swings around from the south-west later in the day.

"The westerly winds will hang around for Friday and then it's just a moderate northerly winds throughout the day on Saturday. The focus will definitely be on the rainfall later in the day.

"Throughout Saturday evening and into Sunday we'll see the rain contract to eastern districts, then it's a mostly dry afternoon on Sunday.

"We'll continue to see an easing trend throughout the day, and then Monday and Tuesday it's mid-teens and then by Wednesday back to northerly winds and warmer temperatures."

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