The first half of the week will be warm and humid with temperatures reaching 24 degrees in parts and it will turn cooler on Friday and into next weekend, according to Met Eireann.
It is forecast to be a warm and humid day today with hazy sunshine and it will be mostly dry in Munster and south Leinster with just isolated light showers.
However, Met Eireann has said that showers across the northern half of the country will become widespread this afternoon with a risk of some heavy or thundery downpours, mainly in Ulster and parts of north Leinster.
There will be high temperatures of 18 to 23 degrees today and it will be coolest along coasts due to sea breezes.
It will be misty though with fog, especially on hills and some coasts. Lowest temperatures tonight will range between 11 to 15 degrees in light variable breezes.
With rain forecast this week, the good drying conditions will deteriorate and spraying conditions will be good.
All lands are trafficable at the moment, according to Met Eireann and soil moisture deficits are high at the moment and may impact on growth in some areas.
However, the expected rainfall should help as the week progresses, it said.
Wednesday
Tomorrow Wednesday is forecast to be another warm and humid day. It will be dry in many areas but some well scattered showers will develop in the afternoon.
Highest temperatures will range between 18 to 24 or possibly 25 degrees, while Met Eireann has said that winds will be light variable or calm for inland areas but sea breezes will develop along the coasts.
Wednesday night will be dry but very misty with fog and it will be humid with overnight lows of 10 to 15 degrees.
Thursday
It will be warm, close and mostly dry on Thursday, with just a few isolated showers possibly in the afternoon, according to Met Eireann.
Afternoon temperatures are forecast to range between 18 to 23 degrees, coolest on coasts.
Later Thursday and on Thursday night persistent rain is forecast to develop in the west and southwest and extend to other areas overnight.
Friday
Current indications suggest that it will be rather cloudy on Friday with showery rain in many areas at times during the day but turning brighter with sunny spells developing in southwestern and western areas later in the day.
It will be fresher and cooler than previous days with afternoon highs of 17 to 20 degrees.
Outlook for next weekend
Met Eireann has said that the Atlantic will determine the weather for the weekend and into next week, with temperatures around normal for early June.
It is forecast to be changeable with some rain or showers at times but there will be drier, bright periods as well with some sunshine.
Maximum temperatures of next weekend look set to range between 16 to 19 or possibly 20 degrees and winds will be mainly between south and west in direction