Temperatures could hit 0 degrees overnight this week but Met Éireann is forecasting a slight upturn in fortunes later in the week.
In its latest forecast, Met Éireann predicts the weather will turn "quite settled with slacker winds and patchy rain or drizzle at times, while temperatures will be a near average generally."
Before that we could have to endure some colder nights with temperature to slump to zero overnight on Monday.
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Met Éireann says Sunday will be sunny with some blustery showers.
They added: "The showers will be heaviest and most frequent over the western half of the country with a chance of isolated thunderstorms and hail. Highest temperatures of 9 to 11 degrees. Southwesterly winds will be strong and gusty closer to the Atlantic, and generally moderate to fresh elsewhere.
"Scattered showers early tonight will gradually become more isolated towards morning with moderating westerly winds. Lowest temperatures of 2 and 7 degrees, coldest in Ulster. Some mist patches with possible frost for sheltered areas."
For Monday, forecasters predict it will be "generally dry and sunny with just isolated showers, mostly near western and northern Atlantic coasts. Highest temperatures of 8 to 11 degrees, coolest across the east and northeast. Moderate to fresh northwesterly winds will ease off light and variable by evening."
However, they do say it will be "cold and generally dry" on Monday night with "a varying amount of cloud and clear spells. Lowest temperatures of 0 to 5 degrees with some frost possible locally. In light variable winds mist and fog will develop also, and may become dense in places."
The forecast continues: "On Tuesday morning mist and fog will be slow to clear the northern half of the country but otherwise it will be generally dry with a mix of cloud and clear spells. Highest temperatures of 6 to 11 degrees, remaining coolest where fog persists in light southerly breezes. Rain and breezier conditions will develop in the southwest during the evening."
Tuesday night will see "a mix of cloud and clear spells, cloudiest in the west where some patchy outbreaks of rain will develop in moderate to fresh southeast winds, drier and brighter to the east where winds will also be lighter and it will be coolest with lowest temperatures of 3 to 8 degrees generally."
Wednesday will be mostly cloudy with the best of the brighter spells in the south, according to Met Éireann.
"Some patchy outbreaks of rain are possible, mostly near northwest coast. Highest temperatures around 8 to 11 degrees in light to moderate southeast winds.
"While it [Wednesday night] will be mostly dry with good clear spells, some isolated patches of drizzle are possible near southern and eastern coasts. Lowest temperatures of 2 to 5 degrees in mostly light southeasterly breezes."
We can expect sunny spells and some patchy outbreaks of rain or drizzle at times on Thursday with highest temperatures around 7 to 11 degrees in light easterly breezes."
Beyond that, Met Éireann says "uncertainty grows towards the weekend with some outbreaks of rain at times in the south and west but it will be generally settled but cooler in moderate easterly winds."
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