It looks like today will be one of the hottest days of the year.
Forecasters say temperatures could reach 27 degrees in places, with the west of the country due to get the best of the weather.
"We're looking at temperatures possibly getting into the high 20s," said Met Eireann's Liz Walsh.
"At present, 22 to 26 degrees is possible but we can't rule out 27 degrees somewhere in the mid-west.
As the country looks for ways to cool down in the heat, we're being reminded not to swim in ESB reservoirs.
ESB says they can be seriously dangerous due to the risk of uneven ground, deep waters, changing water levels and fast-flowing waters.
These include the reservoirs at Poulaphoca and Golden Falls in Wicklow, Leixlip in Kildare, Inniscarra and Carrigadrohid in Cork, the Ardnacrusha headrace and tailrace canal in County Clare and Dunlewey Lough, Assaroe and Lough Nacung in County Donegal.