Temperatures are expected to nudge 30 degrees in Bendigo in a week when parts of central Victoria will brace for frost.
Maryborough and Castlemaine are within the frost warning tonight, but they and the rest of the region can expect the barometer to climb throughout the week.
It will reach 28 in Maryborough and Castlemaine by Thursday. Bendigo can expect 29 and Echuca 31.
Such warm weather in the first week of October happens once every five years on average, Bureau of Meteorology senior forecaster Tom Delamotte said.
"The last time it happened was in 2015, when Bendigo had 35.1 degrees on one day in the first week of October," he said.
"So this week we will not see temperatures rise to record levels, but we certainly have not had a week like this in a while."
The weather would be driven by a low pressure trough forming over the Western Australian interior, Mr Delamotte said.
Temperatures will dip slightly from Friday, before another low pressure trough drives another spike to 29 degrees in Bendigo on Sunday.
"We are expecting northerly winds will drag the heat down to Victoria ahead of those troughs," Mr Delamotte said.
Have you signed up to the Bendigo Advertiser's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in central Victoria.
Sign up for our newsletter to stay up to date.