The Met Office has issued a weather warning for freezing fog in parts of Wales.
A yellow warning is in place overnight on Tuesday and on Wednesday morning as high pressure brings a change in the weather.
The warning, which is in place from 10pm on Tuesday until noon on Wednesday, states: "Fog patches are expected to form during Tuesday night, becoming dense and freezing in places by dawn on Wednesday, particularly in river valleys with visibility less than 100m at times.
"Fog will thin slowly later Wednesday morning although a few patches may persist into the afternoon over the south-west Midlands."
The areas covered by the warning are Caerphilly, Monmouthshire, Newport, Torfaen, and the Vale of Glamorgan.
BBC Wales weather forecaster Derek Brockway has said: "A big change on the way! A cold front and rain will move southeast on Tuesday.
"Behind it much clearer air. Dry and settled conditions ahead thanks to high pressure. Bright skies and sunshine but colder nights with frost and patches of low cloud and fog."
He tweeted the forecast for Wednesday.
The Met Office forecast for Wales says: "A cold and frosty start on Wednesday with some patchy fog in places. The fog will slowly lift and clear mid-morning onwards, leaving a fine and sunny afternoon. Maximum temperature 9°C.
" Fine, dry, and settled on Thursday and Friday, although some morning fog may linger all day. A grey, foggy start Saturday then cloudy but largely dry throughout the day."
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