Snow's been falling for most of the night in parts of south-east Wales, and the Met Office says there's more to come.
An amber 'be prepared' warning will remain in place until 9am, with a yellow warning of ice across the whole country.
Cardiff and Vale University Health Board has cancelled the majority of outpatient appointments.
David Wood reports from Porth, in the Rhondda.
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It's judgement day at the Millennium Stadium as Cardiff Blues take on the Ospreys and the Newport Gwent Dragons face the Scarlets.
Showers expected throughout the day especially in the north. Drier and brighter elsewhere but cooler than in recent days.
Most places will become dry overnight, although it will remain generally cloudy with patches of hill fog.