Met Eireann says icy stretches, sleet and snow will remain throughout the day.
Two cold weather warnings have been issued for the country, with the latter expiring tomorrow morning.
A snow/ice warning is in effect until 7pm this evening with scattered falls of sleet, snow and hail continuing for the rest of the day, creating icy and hazardous conditions.
From 7pm until 10am tomorrow morning a low temperature and ice warning comes into effect.
Met Eireann is forecasting icy and very cold conditions overnight, with lowest temperatures of -5 to -2 degrees Celsius generally, but colder locally.
Snow carpeted many parts of the country overnight, affecting roads across the region.
Extreme caution is advised around Clifden and on the N59 between there and Maam Cross after snowfall last night.
AA Roadwatch Deputy Editor, Lauren Beehan, says road conditions are challenging across the country this afternoon: