Icy patches are expected to form on untreated surfaces during Wednesday evening and overnight into Thursday as temperatures drop below freezing, according to the Met Office.
Areas in north Wales are mainly affected, with yellow weather warnings in place from 16:00 GMT on Wednesday until 10:00 on Thursday.
A few sleet or snow showers will also be likely, particularly close to coasts.
The forecaster has warned that people should expect some roads and railways to be affected with longer journey time.
By the weekend, the cold air is set to be replaced by milder south-westerly winds with potentially wet and very windy weather sweeping in.
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