Gourock and Port Glasgow were due to kick-off the festive season last week before torrential rain caused chaos in the area.
Inverclyde Provost Michael McCormick said: "We really were left without any choice with the horrific weather we endured last Tuesday.
"Inverclyde was effectively cut off from the outside world and it would simply have been far too dangerous to have gone ahead.
"I am delighted we have managed to rearrange the celebrations and I hope people will turn out in large numbers to join in the fun."
The events in Gourock and Port Glasgow have been organised by Inverclyde Council's Events team and celebrations in both towns will be held from 7pm tomorrow.
Many parts of central and southern Scotland were affected by the flooding, including Dunbartonshire, Inverclyde and Renfrewshire.
In Greenock, guests were stranded in the Holiday Inn hotel after flood water engulfed the car park and foyer.
And drivers on the A8 near Langbank were stuck for several hours as emergency services cleared flood water.
Despite the bad weather, November was one of the warmest on record in Scotland. The average temperature for the month was 7.8C, half a degree warmer than the last record temperature in 1994 and three degrees up on the yearly average, the Met Office said.