Met Eireann has issued a Status Yellow Thunderstorm warning for Ireland as the current week of glorious sunshine comes to an abrupt end.
The warning will come into place at 3pm Sunday and will remain in place until 3am on Monday.
The forecaster said: "some places will stay dry, hit & miss thunderstorm activity along with hail & heavy downpours may lead to spot flooding & hazardous driving conditions."
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Meanwhile, people are urged to enjoy the sunshine safely today as it will be hot and sunny with highest temperatures generally 26 to 31 degrees, possibly a degree higher in parts of Leinster and Munster.
Some cloud will bubble up later this afternoon and evening, bringing a few showers, some of these possibly heavy and thundery, particularly around the midlands, with some hail possible also.
Most areas will have a light northeasterly wind, but there will be a sea breeze, which will keep temperatures slightly lower near coasts.
Tonight will be warm, with temperatures staying above 14 to 19 degrees. Most areas will be dry with clear spells, but a few showers possibly continuing for a time early in the night in Ulster and Connacht, and some of these may be heavy. Winds will be light and variable, and patches of mist and fog will develop.
Tomorrow will be another hot day with temperatures reaching 25 to 30 degrees, although it won't be as hot in the north and northwest.
Most parts of the country will be dry and sunny during the morning, but there will be a few showers in northern areas, possibly heavy.
Throughout the afternoon and evening, scattered heavy and thundery showers will develop across the country, some of which with hail. Slow-moving downpours are possible, causing spot flooding. Winds will be light and variable.
Sunday night will be warm and humid, with temperatures staying above 13 to 17 degrees.
Early in the night, there will be mostly dry and clear conditions, but cloud and showers will move into the west and southwest and will spread northeastwards across much of the country overnight.
Some heavy and thundery falls are possible early on. There will be light northerly or variable winds.
Showery rain will continue to move northeastwards across the country on Monday morning. This will be followed by scattered showers and occasional sunny breaks from the southwest.
The showers are likely to be heavy in Munster and south Leinster, with a chance of thunder, so spot flooding is possible. Highest temperatures will range between 15 degrees in the northwest and 23 degrees in the southeast, so not as warm as the weekend. Light to moderate northerly winds, becoming fresh on Atlantic coasts.
Mostly cloudy with scattered showers overnight, mainly in the east. Lowest temperatures of 12 to 15 degrees in a moderate northerly breeze.
Cooler and cloudier on Tuesday with scattered showers, mainly over the eastern half of the country with drier weather in the west.
Highest temperatures of 14 to 21 degrees, mildest in the southeast, with a light to moderate northerly wind.
Showers will become isolated on Tuesday night, but it will stay rather cloudy. Minimum temperatures of 12 to 17 degrees in a light northerly breeze.
A mostly cloudy day with a few showers in the east on Wednesday. Highest temperatures of 15 to 22 degrees in a light north to northwest breeze.
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