In its updated weather prediction the Met Office warns that the public in South Devon should get ready for another round of travel disruption and flooding as more heavy rain is set to fall onto already saturated ground.
Andy Page, Met Office Chief Forecaster, said: "Following a very wet and windy weekend, there is yet more rain expected to spread from the South West this evening and during Monday. This will give 10 to 20 mm of rain quite widely across parts of England and Wales but south west England might see in excess of 30 mm in places."
The predicted heavy rains spell more bad news for people living in flood risk areas and anyone planning to travel over the Christmas days.
Darron Burness, the AA's Head of Special Operations, said: "The run-up to Christmas is one of the busiest times of the year for traffic so any bad weather can have a big impact on the roads. Even if you know your local roads, don't be complacent, as flash flooding is a real risk with so much water around."
Mr. Burness advised people to check for local weather forecasts from the Met Office and travel reports and avoid non-essential travel in rain affected areas.
"If you do head out, allow more time for your journey as you don't want to rush in conditions like this," he said.
The Met Office said that the weather showed signs of becoming a little quieter for Christmas Day, with some sunshine for many central and eastern areas and showers across southern and western Britain.