Met Éireann is predicting Ireland may experience "heatwave conditions" starting from Wednesday, with temperatures above 25 degrees Celsius for a period of five days or more.
Meteorologist Michelle Dillon said the hot weather is expected to extend across the country, though there will be lower temperatures in some coastal areas where there will be sea breezes.
Earlier today the forecaster issued a weather advisory for warm weather.
"Ireland will experience a hot spell developing from Wednesday and continuing through the rest of the week and the weekend," a spokesperson said.
"Daytime temperatures will widely reach the mid to high twenties. It will remain uncomfortably warm overnight."
Met Éireann is warning of the risk of heat stress, especially for the more vulnerable members of the population.
It also warns that the hot weather will result in a high solar UV index. This means more potential for sun damage to the skin and eyes, and a shorter the time before skin damage
A risk of water-related incidents is also being advised by the Met office.
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Irish Water confirmed that the "vast majority" of its 750 water treatment plants across the country continue to meet the demand for water supply.
However, 13 areas have been impacted by shortages. They are as follows:
- Wexford Wexford Town
- Wexford Killmallock Bridge WTP (water treatment plant)
- Wexford Taylorstown New WTP
- Kilkenny Bennettsbridge WTP
- Kilkenny Clogh Castlecomer WTP (Loon WTP )
- Wexford Bunclody
- Laois Swan WTP
- Limerick Oola WTP
- Cork Whitechurch WTP
- Galway Inis Oirr WTP
- Cork Roberts Cove Reservoir
- Clare Carron Abstraction Site (Termon Spring )
- Cork Coppeen Pump Station
Irish Water said it has implemented a range of measures in the affected locations, such as tankering and /or night time restrictions to protect supplies and ensure water keeps flowing to homes and businesses.
A spokesperson said: "We will continue to monitor the levels at all our supplies over the coming weeks and months and take any actions that may be necessary to maintain supplies, including communicating about localised issues as they arise."