With the RSA sharing safety tips for drivers
A status yellow fog warning is due to take effect from 6pm for the whole country.
Met Eireann is warning for the possibility of hazardous travelling conditions.
In fog, the RSA advises using your fog light if visibility drops below 100 metres and to leave extra distance between you and the vehicle in front.
Met Eireann Forecaster Andrew Doran Sherlock says the warning lasts until tomorrow at 9am.