Temperatures are set to hit the mid-20s by midweek
The country is in for mild, warm weather for the rest of the week and into the weekend.
Met Éireann says Tuesday will be very mild and humid, with afternoon highs of 17 to 21 degrees.
These temperatures will be highest in parts of the south and east.
There will also be some cloud and a little patchy rain or drizzle, but it will be mostly dry.
Tuesday night will also be mild - with some mist, patchy drizzle or fog in places - but overnight lows of just 11 or 12 degrees.
Wednesday to Friday will see the warm and mainly dry conditions continue.
High pressure will bring mainly dry weather this week and it will turn very warm and sunny for most by Friday pic.twitter.com/KRv54BOZyK— Met Office (@metoffice) May 21, 2017
A rather cloudy start is forecast on Wednesday, but cloud will break up well during the afternoon with good sunny spells developing.
Some good sunshine is also expected on Thursday.
Met Éireann say there are indications of more cloud about on Friday, with some showers breaking out in western areas.
But warm and humid temperatures will continue, with afternoon temperatures in the low-20s on Wednesday and in the low to mid-20s on Thursday and Friday.
The weekend will see some uncertainty: indications suggest it will turn more unsettled but still be warm and humid on Saturday.
However there will be fresher conditions on Sunday, with some rain expected.