Another 8 to 25 millimetres of rain is expected in Melbourne today.

Melburnians woke to a chilly 9 degrees on Friday morning, with the temperature tipped to reach a maximum of just 15 degrees.

The winds could really whip up in Melbourne's bayside area from about 2pm, making it feel even colder.

It's not good news for footy fans, with Friday night’s MCG clash between Hawthorn and Sydney likely to be marred by strong winds and heavy rain.

The temperature is expected to drop to 10 degrees by 7pm, but the bureau is forecasting winds of up to 40km/h that will make it feel more like 6 degrees.

The weather bureau has also issued a severe weather warning for damaging winds and heavy rainfall across Gippsland and in parts of the Wimmera, and a flood warning for Gippsland and the Upper Yarra catchments.

The rain could lead to flash flooding in parts of the state, according to the bureau, and wind gusts of up to 100km/h.

Winds of 120km/h could also hit the alpine areas.

Between 50 millimetres and 100 millimetres of rain is expected across parts of the Central and Gippsland ranges throughout Friday and early Saturday, which is double the monthly average.

Road chaos

Two people were killed in separate incidents overnight: a motorcyclist on the Princes Highway at Oakleigh East, and a man on the Monash Freeway near Mount Waverley.

Police believe a man pulled his car into the Monash Freeway's emergency lane and got out of the vehicle before being hit by a truck. He died in hospital.

As a result of the crash, a semi-trailer and Toyota then collided. The Toyota driver was taken to hospital with life-threatening injuries, while the truck driver sustained minor injuries.

Streets including Montague Street under the Westgate Freeway, the bottom of Oliver's Hill in Frankston and King Street in Templestowe flooded during the morning downpour.

The wild weather also delayed flights, with a spokesman for Melbourne Airport advising passengers to check with airlines before leaving home to see if their flight is affected.

And thousands of people in the south-west coastal region of the state are without power. More than 4,000 people in Apollo Bay, Marengo and Skenes Creek are affected by the outages.

Early snow 

Snow is falling in the alpine areas, with 15 centimetres recorded at Mount Hotham in the past 24 hours, and 16 centimetres at Mount Buller.

"At the moment it's showery, and another band of rain is coming up across Tasmania at the moment," Bureau of Meteorology duty forecaster Richard Russell said.

"We will get the western edge of that. It will rain heavily during the early afternoon."

VicRoads has issued warnings to motorists while State Emergency Service volunteers are suiting up for a busy day.

"We had 42 requests for assistance overnight across the state and are starting to see an increase now in requests for assistance – trees down and building damage," said SES spokesman Kelvin Jewell.

"At this stage, it's still very much a message of preparedness and making sure the community are doing what they can to their properties before they head off for work, before that weather arrives today."

He said sand-bagging stations were ready if needed.

Melbourne's average April rainfall is 57.3 millimetres, while May's average is 55.7 millimetres. But this year, April was particularly dry, with suburbs including Mitcham in the east recording its lowest total April rainfall on record, with just 16.2 millimetres.