The fine weather is to draw to a close, with showers and dipping temperatures forecast for the next 10 days.
Rain will sweep over the country this afternoon as cooler Atlantic conditions replace the high pressure front that brought warm weather during the past week.
Met Éireann's Linda Hughes said autumn staycationers can expect unsettled conditions.
Temperatures will also drop dramatically from the highs of 20C last week, with some areas set to experience an eight degree drop over the space of seven days.
"Tuesday will be mostly cloudy, and it will turn rather breezy while rain will arrive in the northwest by late morning and will move southeast across the country through the afternoon and evening," Ms Hughes said.
"The highest temperatures will be 15C to 18C."
Tomorrow will be a cool day with sunny spells and some rain. The showers will be mainly in the west early in the day but will move across the country in the afternoon.
Highest temperatures tomorrow will be between 11C and 14C.
"On Wednesday evening, winds will be southerly and freshen in the southwest as persistent rain arrives there," Ms Hughes said.
"This rain is expected to extend northeastwards to most areas on Wednesday night, although Ulster should remain dry."
Outbreaks of rain will continue on Thursday, but there will also be some bright or sunny spells at times.
However, it will be another cool day, with highest temperatures of 10C to 13C.
Friday looks like being a dry day with good spells of sunshine.