The Met Office has issued a yellow "be aware" warning of ice for Denbighshire, Flintshire, Powys, Wrexham and Monmouthshire.
It says there could be difficult driving conditions in places.
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Only a handful of these marine mammals are seen each year but last week a record number were recorded off the coast of North Wales.
Lots of sunshine for you again today, but make no mistake.... it is cold out there!
The Queen and Prince Harry welcomed the Wales Rugby World Cup squad at a glittering reception at Buckingham Palace.