Large parts of the country will experience a sunny and dry Wednesday - but thundery showers may hit coastlines in the evening.
Met Eireann is forecasting highs of 24C, with Munster and Leinster to see the best conditions.
Connacht and Ulster will get scattered showers throughout the afternoon, and western counties are in for more persistent rain in the evening.
A forecaster said: "Many areas will be dry today, with bright or sunny spells, but some scattered showers will occur, mainly in parts of Munster and Connacht.
"Maximum temperatures 18 to 24 Celsius, in mostly moderate southerly winds.
"More persistent rain and drizzle will develop in parts of the west this evening, mainly in coastal areas, with freshening southeasterly winds."
A very mild and humid Wednesday night is in store for Ireland, but brief thunderstorms may hit coastal counties.
Strong winds could affect southern and western areas overnight. Lowest temperatures will range from 14C to 17C.
A Met Eireann forecaster said: "Tonight will remain dry in most areas, but outbreaks of rain and drizzle will develop in west Munster and in parts of west Connacht, with a risk of some heavy, thundery bursts, especially along the coast.
"A few isolated showers may occur elsewhere. Very mild and humid, with some hill and coastal fog.
"Minimum temperatures 14 to 17 Celsius, in mostly moderate southeasterly winds, fresh to strong in southern and western coastal areas."
