There's a hot weather warning for tomorrow. Temperatures are expected to reach between 26-29 degrees in Dublin.
Met Eireann says the warning is also in place for Carlow, Kildare, Wicklow and Meath from 12 o'clock tomorrow afternoon until six in the evening.
Crowds heading to Justin Bieber's outdoor show at the RDS are being reminded to wear sunscreen.
The rest of the country will be mainly dry and very warm. There could be some showers in the morning with a risk of thunder. However, the afternoon will be sunny with top temperatures of 22-26 degrees. Leinster will be the hottest on Wednesday with highs of 27 or 28 degrees forecast.
The weather is set to change slightly on Thursday. It'll be fresh with a mix of bright spells and scattered showers. There'll be some rain the the west of the country with highs of 16-20 degrees.
It's set to become more unsettled from Friday onwards, with some sunny spells and showers forecast. Temperatures will range between 14-19 degrees over the weekend.