There could be some mist patches around tonight. I think we are talking more mist than fog, and the south of the Central region is more prone than the north.
It should be colder than last night, lows around freezing or just below with an air frost for all; and it could be even colder out in the countryside.
Tomorrow morning: a slow start in any mist and foggy areas. Sunny breaks elsewhere with light winds. On the whole, the day will evolve in a similar way to today: great sun by the afternoon, highs of 7 to 9c.