Weatherzone and the BOM dispute your forecast greatly. Unless you know something that they don't. No weather warnings are imminent for Ballarat, so I'm confident of a good day:
BOM Forecast for Ballatat this Saturday:
12-25 degrees
Cloudy. High (70%) chance of showers, most likely from the late morning. The chance of a thunderstorm in the afternoon and evening. Winds northerly 25 to 30 km/h increasing to 30 to 40 km/h in the middle of the day then shifting cooler west to northwesterly 25 to 40 km/h in the early afternoon.
Have a great weekend, keep dry and enjoy the footy.