A spell of rain, sleet and hill snow will move east through Saturday evening before skies clear leading to ice developing on untreated roads, pavements and cycle paths.
Some injuries from slips and falls are possible on icy surfaces.
Some roads and railways likely to be affected with longer journey times by road, bus and train services.
A spokesman for the Met Office said: “A band of rain and hill snow is expected to clear eastwards on Saturday night with clearer skies and scattered sleet, snow and hail showers following.
“2-5 cm of snow may accumulate above 150 metres with some snow to low levels too, particularly across Northern Ireland and Scotland.
“Showers are likely to fall as rain along western coasts though. Where skies clear after showers, ice is likely to develop on untreated surfaces later in the night.”