Friday will begin quite wet, with rain spreading eastwards.
The rain will be heavy in places, with Met Éireann warning of some thundery downpours possible.
Sunny spells and well scattered showers will follow into the northwest from around noon, with the rain gradually clearing the southeast later in the afternoon.
Highest temperatures of 14°C to 17°C in light to moderate southwesterly winds, veering northwesterly later as rain clears.
Friday night will be mostly dry, with long clear spells and just the odd stray shower.
Lowest temperatures will be of 4°C to 8°C generally.
However, it will become quite foggy throughout the night in light breezes.
Mist and fog will clear from most areas on Saturday morning, though light variable breezes will allow some coastal fog to persist through the day, Met Éireann said.
A largely dry day, but becoming cloudy from the west through the morning, with a few patches of light rain and drizzle.
Highest temperatures of 15°C to 18°C.
Saturday night will be predominately dry, with just a few patches of light rain or drizzle.
Towards morning, a band of rain will move into parts of Connacht.
Temperatures will fall to between 8°C and 11°C.
There will be a good deal of cloud at first on Sunday, with outbreaks of rain tracking eastwards across the country, becoming patchier as it does so.
Sunny spells will follow through the morning and afternoon as good dry intervals develop.
Highest temperatures of 14°C to 18°C in light to moderate southwesterly breezes.
Sunday night will be largely dry and mild, with a few patches of drizzle. Some mist and fog will develop again in mostly light breezes.
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