Farmers in the south-west can expect the wet weather to remain until summer, according to the Bureau of Meteorology.
Record rainfalls showed the highest measurements in a century for September and Victorian climatologist Kevin Smith said the soil could remain damp for a while.
He said the climate had been fluctuating around a La Nina, bringing wetter conditions due to record sea temperatures.
“Waters here are still very warm,” Mr Smith said. "We’re likely to see the influence of that through to December, with an 80 per cent chance of rainfall.”
While even small falls could cause flooding, Mortlake farmer Steve Parker said for farmers, there was “never too much water”.