MOTORISTS are being warned they face the first icy roads of the autumn over the weekend.
The mercury will dip below freezing, leaving dangerous frost on many roads.
Met Eireann says that the weekend will see unsettled and changeable weather, and it will become much colder.
Temperatures are set to fall to minus 1 in some areas tomorrow night, resulting in a sharp frost.
Drivers around the country were also warned to take extra care after heavy rainfall left roads flooded, and caused a mudslide on a main road in the midlands.
The Met office said the heavy showers are likely to continue today with the possibility of more spot flooding in some parts.
More showers or longer spells of rain are expected to move in from the Atlantic over the weekend, with the southern half of the country most likely to be affected.
Monday night will be cold, with some frost in many places, with lowest temperatures ranging from minus to plus three.
Meanwhile, excess surface water is causing problems in some parts of the country.
AA Roadwatch said drivers should use dipped headlights to improve visibility and only drive through water if they know it is not too deep for their car.
"If you have to drive through standing water, drive through the centre of the road as that is the highest point," it added.
About 25 first-class students were marooned when rising floodwater surrounded their classroom in Co Westmeath yesterday.
The pupils of Cornamaddy National School -- all aged between six and seven years old -- were using the prefab on the school grounds.
School principal Aidan Barry said there was a lot of rain overnight and water had gathered in the school's football pitch and main yard.