Eastern parts of Northern Ireland could also see a little snow overnight with up to 10cm possible over the hills.
Snow and ice will also affect parts of southern and eastern Scotland through the early hours, with wintry showers in northern Scotland also giving the chance of slippery conditions.
Across southern counties of England and southern Wales any snow is likely to turn back to rain as milder air pushes in – temperatures in parts of south west England could be as high as 12C by the end of the night.
On Sunday further snow is expected to accumulate across parts of northern England, Northern Ireland and Scotland, where it will remain cold.
Heavy rain will be more of an issue across Wales, central and southern England where milder conditions will develop.
Fresh yellow weather warnings will also come into force in some areas on Sunday.
Heavy rain and thawing snow could lead to flooding in some parts of north-west England and Wales, while localised snow and ice warnings cover parts of Scotland where it will remain cold.
Temperatures are forecast to dip again from Monday, and UK Health Security Agency (UKHSA) amber cold weather health alerts for all of England remain in place.