Information suppied by Met Éireann
Scattered showers this morning will turn heavy with the risk of some thundery downpours before clearing northeastwards.
Later it will become mostly dry over much of the country with sunny spells developing and just a few scattered showers remaining, mainly in the north and northeast.
It will be very warm and humid with top temperatures reaching 22 to 28 degrees, highest in parts of Leinster.
However, it will be cooler in Atlantic coastal areas, with values of 18 to 21 degrees.
Winds will be light, mainly southerly, later increasing moderate westerly.
Tonight will be mostly dry with good clear spells at first but outbreaks of rain will develop later.
Light to moderate westerly winds veer northwesterly and lowest temperatures fall to 10 to 14 degrees.
A high temperature warning is in place for Dublin, Carlow, Kildare, Wicklow and Meath.
Maximum temperatures of 27 or 28 degrees are expected on Wednesday.