[A] band of rain and hill snow will increasingly turn to snow to lower levels through Friday evening and overnight into Saturday.
This band will gradually ease during Saturday morning as it moves south-westwards, allowing ice to form as it clears.
Some roads and railways are likely to be affected with longer journey times by road, bus and train services.
Icy patches are likely on untreated roads, pavements and cycle paths.
A spokesman for the Met Office said: “Rain will increasingly turn to hill snow above around 200m during Friday evening.
“By Saturday morning 5-10 cm of snow may accumulate on high ground above 200m.
“Some snow is expected even to low levels overnight into Saturday morning with a patchy 1-2 cm possible in places.”