Autumn has arrived but warm weather is here to stay a little longer with temperatures expected to reach up to 23 degrees in places today.
There will be afternoon highs of 17 to 20 degrees, reaching up to 22 or 23 degrees where sunny breaks develop, Met Éireann says.
While the day will be dry at first, rain in the west will turn persistent there during the morning and move eastward later this afternoon and evening, but becoming more scattered.
The 80,000-plus crowd bound at the All-Ireland senior football final between Dublin and Tyrone in Croke Park can expect a dry, humid afternoon, but those at Electric Picnic in Stradbally, Co Laois will probably need a poncho come evening time as rain starts to move in.
Temperatures will drop to 7-11 degrees on Sunday night with rain expected to clear southeastwards overnight. Monday will be dry with a possibly cloudy start in parts of the southeast.
Met Éireann says the day will clear be bright with good sunny spells with moderate westerly breezes with highest temperatures reaching 15 to 18 degrees.