Snow is falling on Victoria's alps and sprinkling the Grampians after a cold front passed through the state.
Falls Creek, Mount Hotham, Mount Buller and Mount Baw Baw all received considerable amounts of snow on overnight on Wednesday, the Bureau of Meteorology said.
"We're seeing snow falling to 800m so it's definitely snowing on the Grampians," senior forecaster Michael Efron said on Thursday.
Mt Baw Baw Alpine Resort spokesman John Fascio said it was likely to receive a further 30cm by Friday.
"With the official snow season launch only a few weeks away, if this weather continues we'll be in for one of our best snow seasons yet," he told AAP.
The cold front hit Melbourne just after 10.30pm on Wednesday, with temperatures plunging around the state and now struggling to rise.
"Across the state, we are struggling to see temperatures crack the double digits," Mr Efron said.
"The mildest temperatures are probably on the bay and in Melbourne. Most of the state hasn't reached 10C."
But the worst is yet to come, with rain, hail, thunder and strong winds expected to blast the state on Thursday and Friday.
Gippsland, in the state's east, is forecast to have 30-50mm of rain on Thursday before the drenching continues on Friday, with up to 150mm expected to fall.
"While there is a slight chance of flooding, considering it has been extremely dry in Gippsland, the rain is very welcome," Mr Efron said.
The bureau is likely to issue a severe weather warning for heavy rain and damaging winds for Friday.
Farmers are being warned to shelter their sheep and lambs, which could die if exposed to the cold conditions.