Forecasters say the conditions may lead to travel disruption.
A status yellow ice and temperature warning remains in place across the country this morning.
Met Éireann expect widespread frost and icy stretches to impact the country until 10am.
A frosty start in many areas this morning with some icy stretches 🥶. It'll be a mostly dry day nationwide with lots of crisp winter sunshine but a few showers are possible in Atlantic coastal areas & along the N coast🌦️— Met Éireann (@MetEireann) January 5, 2022
🌡️Highs of 3 to 6°C in light northwest or variable winds. pic.twitter.com/LLDTW6hWxS
Temperatures are expected to reach as low as -3 degrees in many areas.
Forecasters say it may lead to some travel disruption.