Melbourne has recorded its wettest and coldest day for 2019 so far.
Temperatures climbed to a modest maximum of 14C on Friday with up to 15mm of rain falling across the city, according to the Bureau of Meteorology.
In some eastern suburbs, 15mm of rain fell in as many minutes.
"It's arguably the wettest day of the year so far," senior forecaster Richard Carlyon said.
The Melbourne city gauge recorded 7mm before 9am and a further 8mm through until early afternoon, with more showers expected.
Between 10mm to 15mm rain fell in just 15 minutes in some eastern suburbs as heavy showers and thunderstorms passed over about lunchtime, Mr Carlyon said.
Before Friday, the most daily rain Melbourne had recorded was 11mm on February 7.
Up to 20mm was expected to fall across most of the metropolitan area by the end of Friday, with heavier falls in the western and northwestern suburbs.
"If we exceed 11mm, which is definitely a pretty decent risk, it is going to be the wettest day of 2019 so far," forecaster Keris Arndt said.
Areas west of Melbourne recorded the highest rainfall, with 56mm up to 9am at Aireys Inlet and 44mm at Ballarat.
The State Emergency Service received more than 240 calls for help across the state since Thursday night for building damage, flooding and fallen trees.
It came as the Wonthaggi Life Saving Club on the Gippsland coast was inundated by floodwaters on Friday, with the club saying on social media the "devastation is beyond words".
Meanwhile, drivers were urged to slow down and take care on the roads and avoid driving through floodwaters.
Heavy rain was expected to reduce visibility, making road conditions dangerous across the inner, western, northern, eastern and southeastern suburbs.
While the Bureau of Meteorology said it wasn't an unusual amount of rain for this time of year, senior forecaster Richard Carlyon warned autumn leaves blocking drains could lead to localised flash flooding.
The wet, chilly weather was also forecast to bring snow in alpine areas, in altitudes as low as 1000m, with around 5-to-10cm possible.
