Most areas will be dry on Friday, apart from a few patches of light rain or drizzle.
Met Éireann has said that it will be cloudy across the bulk of the country, but there will be occasional sunny interludes.
Maximum temperatures will range between 7°C and 10°C in mostly light southwest or variable winds, with areas of mist and localised fog patches.
A freshening southwest breeze will develop along the west and north coasts later.
Friday night is forecast to stay mostly cloudy overnight, but predominantly dry, with just a few patches of light rain or drizzle.
Some mist or fog is also forecast in light to moderate southwest breezes. Minimum temperatures on Friday night will stay between 3°C and 6°C.
A good deal of dry weather is forecast across the country on Saturday, but with plenty of cloud and scattered patches of drizzle and mist.
The best of any bright or sunny spells will be in the east and northeast, Met Éireann said, with highest temperatures ranging from 6°C to 9°C in moderate southerly breezes, fresh along west and northwest coasts.
A band of rain will push in from the Atlantic on Saturday night, which is forecast to extend eastwards across the country during the course of the night. Minimum temperatures will vary from 4°C to 7°C.
Rain is forecast to clear quickly from the east on Sunday to leave a cold and blustery day, with sunshine and scattered showers, some wintry.
Maximum afternoon temperatures will range between 4°C and 7°C in brisk southwest winds. Showers are forecast to become widespread across the country overnight and will turn increasingly wintry, with some falls of sleet or snow.
It will be very cold and frosty, with minimum temperatures of -1°C to 3°C in fresh and gusty southwest winds.
Next week is to start off cold. Current indications suggest it will turn less cold by midweek. It will remain unsettled, with spells of wet and windy weather spreading from the Atlantic.
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