Dublin will be lashed by thundery downpours and flooding before the Bank Holiday scorcher hits.
A weather expert is predicting sizzling temperatures of as high as 22 degrees this weekend.
"The ECMWF is forecasting a fine warm and some nice sunny weekend as high pressure situates around Ireland," Weather Alerts Ireland said on Facebook.
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Today will see a mix of cloud and sunshine but the evening will bring long sunny spells. It will be mostly dry with a few isolated showers.
It will be a mild day with temperatures of 15 to 17 degrees.
Tonight will be dry with long clear spells and the lowest temperatures of 6 or 7 degrees.
Tomorrow will start off sunny but will become becoming cloudier with showery rain moving in from the west during the afternoon with the highest temperatures of 15 to 18 degrees.
Here is what the national forecast says:
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Thursday night
A Met Eireann forecaster said: "Showery rain will become mostly confined to the eastern half of the country early in the night before clearing into the Irish Sea towards morning.
"Drier conditions with clear spells will follow in the clearance from the rain. Lowest temperatures of 6 to 9 degrees in light variable breezes.
Friday
"A good deal of cloud expected with scattered showers though there will be some sunny spells. Some showers will be heavy with a chance of thundery downpours leading to surface water flooding. Highest temperatures of 15 to 18 degrees in mostly light northeasterly breezes.
Friday night
"Early tonight, the showers will die away leaving a largely dry and clear night. Lowest temperatures of 6 to 10 degrees in light breezes.
Bank Holiday Weekend
"There is some uncertainty in the details but current indications suggest that they will be warm and dry days with good spells of sunshine for most though there is a chance of some showers, mainly in the south and southeast where it will be slightly cloudier.
"Highest temperatures of 16 to 20 degrees generally, coolest along eastern coasts due to light to moderate onshore winds but possibly getting into the low 20's in parts of the southwest and west. Dry with long clear spells during the night with temperatures not falling below 7 to 10 degrees.
Bank Holiday Monday
"Largely dry with good sunny spells. Highest temperatures of 17 to 20 degrees, possible reaching 21 degrees, in light southwest breezes"
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