Friday - Day

St. Patrick's day will start generally cloudy with scattered outbreaks of rain and drizzle. The rain will be followed by occasional sunny spells and scattered showers through the afternoon and evening. Some showers will be heavy, particularly in the west with isolated thunderstorms possible over Connacht. Drier in the east and northeast. Highest temperatures of 11 to 14 degrees in a moderate south to southeast breeze.

Friday - Night

The remaining scattered showers will die out, leaving a good deal of dry weather for a time. Outbreaks of rain will develop in the west and northwest towards morning. Patches of mist will develop in a light southerly breeze. Lowest temperatures of 5 to 8 degrees.

Saturday - Day

Tomorrow will begin off dry for many with a few sunny spells. Rain in the west will spread eastwards across the country, reaching the east coast by early afternoon. Sunny spells will develop as the rain clears into the Irish Sea by evening. Highest temperatures of 9 to 13 degrees in a light southerly breeze, increasing moderate to fresh northwesterly as rain clears.

Saturday - Night

Saturday night will be cold and dry. Fresh northwest winds will ease and become light. Frost and some icy patches will develop. Some patches of mist also. Lowest temperatures of -1 to +2 degrees.

Sunday - Day

Sunday will start off dry with occasional sunny periods. Rain will develop in the west during the morning and spread eastwards to all areas through the afternoon. Highest temperatures 8 to 10 degrees moderate south to southeast breezes.

Sunday - Night

On Sunday night, rain will continue and will be most persistent over the northern half of the country. Lowest temperatures of 4 to 7 degrees with moderate southerly breezes