Source: Carlow Weather
There will be a risk of some snow in Ulster on Friday night into Saturday morning and then a low windchill on Sunday morning for a cold start to Saint Patrick’s Day, according to www.carlowweather.com.
Forecaster Alan O'Reilly said it will be a "cool day with some wintry showers on higher ground".
According to Met Éireann, St Patrick's Day will be a cold, breezy day, with sunny spells and scattered showers.
Maximum temperatures 7 to 10 degrees, in moderate to fresh northwesterly winds. Sunday night will be mainly dry, but cold, with a slight frost. Min. 1 to 4 C.
The forecaster has also issued Yellow Warning of snow and ice for Donegal.
It says a spell of snow on Friday night and early Saturday morning will lead to poor driving conditions and accumulations of up to 3cm.
On high ground accumulations are likely to be greater.