Temperatures could reach 20 degrees over the next couple of days.
Met Eireann says it will be warm, sunny and dry until the weekend at least.
It's expected to be warmest in the midlands, with the cooler spells coming along the east coast.
Meteorologist Joanna Donnelly says the forecast for the week is looking positive.
"For the next few days just dry and sunny, with high pressure in command, and light breezes too.
"The outlook for the foreseeable is for continued settled conditions.
"You might see an odd shower pop up at times, but certainly nothing on the horizon to break the nice conditions."
