Met Eireann has issued a nationwide Status Yellow warning for fog.
It's advising of difficult travel conditions this morning with dense fog affecting visibility.
The weather warning runs until 10am today.
According to Met Eireann, the weather forecast for today across the Northern Sound region will consist of mist and fog but it will slowly clear this morning and it will be largely dry.
Cloud and rain will move into east Ulster during the afternoon and scattered showers will also develop in the west by evening.
It will be quite chilly with temperatures only reaching 5 to 8 degrees, in a light to moderate westerly wind.