Temperatures in Dublin are expected to hit up to 26 Degrees today.
Meanwhile, a yellow high temperature warning is in place nationwide.
This week's heatwave could result in the hottest summer in Ireland since the seventies.
Pat Clarke from Met Eireann says a warning like this is rare for Ireland "Temperatures are going to continue to rise this week. They'll be in the high 20's in subsequent days. It has been warm, but it's going to get warmer."