Temperatures are expected to recover after tomorrow night.
Temperatures are set to drop below freezing again tonight, and it'll be coldest in the Midlands.
Met Eireann says a widespread frost will develop in the early hours of Sunday, with dry and clear conditions.
Temperatures are expected to recover after tomorrow night though, with lows of about 6 degrees on Monday and Tuesday evening.
Forecaster Eimear Flood explains why it's been so chilly lately: