Drivers are being warned to exercise extra care when travelling and to follow diversion routes.
Heavy and persistent rainfall is forecast throughout Boxing Day and expected to last until around 10pm this evening. Temperatures will then drop and ice will form to become a hazard.
The Scottish Borders has already suffered significant localised flooding since Christmas night and there are a number or roads closed particularly in the Denholm area.
Response Inspector Bryan Burns of Police Scotland said: “The Borders has seen a significant amount of rain fall since Christmas day and this is set to continue.
“As such, there has been localised flooding and a number of roads are now closed including the A698 Denholm to Hawick, B6405 Denholm to Minto, along with various unclassified roads throughout the region and local diversions are in place.
“Unfortunately, a minority of drivers are choosing to ignore the diversions and are instead taking the chance of driving through flood waters.
“I remind motorists to please take note of the diversions. It may add some time on to your journey but they are there for a good reason – to keep you safe.
“If your journey is absolutely necessary then please plan ahead and allow for extra time for possible delays. Also ensure that you have with you a charged mobile phone and warm clothing in case you get into difficulties.
“Temperatures are expected to plummet this evening and ice will form on road surfaces making them treacherous during tomorrow (Sunday). Please reduce your speed and drive to the conditions.”.
Up-to-date weather information at www.metoffice.gov.uk and live traffic updates at www.trafficscotland.org