UPDATE, 9AM: The Bureau of Meteorology has cancelled the severe weather warning for Ballarat as the thunderstorms move further east.
Ballarat officially ended up recording 40.8mm in the last 24 hours, making it the wettest day of 2020.
EARLIER: A severe weather warning for flash flooding in Ballarat has been issued as heavy rainfall sweeps across the city.
The Bureau of Meteorology issued the alert at 6.11am on Monday, as large downpours hit the region.
The rain bands are sweeping eastwards and are expected to ease by lunchtime.
However, there are still chances of flash flooding in the coming hours.
As of 6.30am, Ballarat had received 40.4mm of rain since 9am on Sunday at the official weather station at the Ballarat airport.
This included a burst of about 20mm between 5.18pm and 5.40pm on Sunday, as well as 8mm between 6am and 6.20am on Monday.
IN OTHER NEWS
In the Midwest Region, in the last 24 hours until 7.45am, State Emergency Service crews have received 53 requests for assistance.
The Ballarat crew has been busiest, followed by the Hepburn and Ararat crews.
Requests for assistance have ranged from 26 for trees down, 17 for flooding (which includes leaking roofs) and nine for building damage.
Once the rain clears, Ballarat can expect a top of 20 degrees on Monday, before the mercury rises in the coming days.
Temperatures will soar well into the 30s later in the week, with 33 degrees forecast on Friday and 34 on Saturday.