Racegoers heading to the Melbourne Cup are advised to pack an umbrella and extra clothing.
The Bureau of Meteorology expects there will be "on and off" showers in Melbourne on Tuesday afternoon, with a top temperature of 17C.
Senior forecaster Stephen King says the showers are due to reach Melbourne from the west about noon.
"There'll certainly be showers around the Melbourne area this afternoon but as to whether they're exactly at Flemington right on Cup time (3pm) is impossible to say," the forecaster told AAP.
Mr King says there's a 50/50 chance of rain falling during the race.
But it's also possible the Cup could be run during a brief spell of sunshine.
Tuesday's showers will be slightly heavier than those that fell on Monday, with up to three millimetres forecast for Melbourne.
It will be windy at the races "but not enough to blow hats away and ruin hairdos or anything like that", Mr King said.
The BOM says the winds will be northwesterly at 20-30km/h before turning west to southwesterly during the afternoon.
